Car stalls and misfires

It idles rough it has trouble accelerating and it stalled out on me so for just the once time.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hello – the stalling and misfiring you are experiencing could have several sources – the idle air control valve (dirty or malfunctioning), or an ignition problem (bad plugs, plug wires or ignition coils). I would recommend having a professional mechanic diagnose this poor performance, making your car perform safely once again. A mobile, professional mechanic, such as one from YourMechanic, will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Chevrolet Impala P0300 Causes

Multiple misfires can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. The most common reason for this to happen is faulty or worn-out spark plug coil packs, especially if it`s been a while since you had a tune-up.

The most common reasons a Chevrolet Impala engine stalling are the fuel system, the air intake system, or the ignition system. Search our network of RepairPal Certified shops near you to speak with a technician about your issue.
Any unusual shaking or vibrating forces coming from the engine is cause for concern. It could be something as simple as old spark plugs producing an uneven power delivery, it could be something serious like worn or broken engine mounts, or it could be even more serious in the case of internal engine damage.
If the check engine light in your Chevrolet Impala starts flashing, that means that the problem needs attention instantly and your Chevrolet should be brought in expeditiously. This blinking light usually indicates a severe engine misfire allowing unburned fuel to be dumped into the exhaust system.
The most common causes of misfires are worn, improperly installed, and mishandled spark plugs, malfunctioning ignition coils, carbon tracking, faulty spark plug wires and vacuum leaks.
A clogged or failed exhaust gas recirculation or crankcase ventilation valve or faulty oxygen sensor can send the wrong signals to the computer and cause misfires.
There are three major causes for a stalled engine: A lack of fuel, a lack of air flow and improper ignition. Running out of fuel is one of the most common causes of engine stalling, but dirty fuel injectors or a plugged fuel filter can also be the culprit.
Shaking or vibrating may be caused by many different things such as faulty spark plugs, poor fuel pressure or misfires. Other things such as a faulty idle air control valve may cause the engine idle to drop below the normal idling RPM which may also cause the motor to shake or vibrate more than normal.
Worn out spark plugs are one of the most common causes of engine shaking. If your spark plugs are dirty or worn out they will be unable to fire properly and create the spark your engine needs to ignite the fuel. This causes your engine to misfire. Replacing your spark plugs is typically inexpensive.
A blinking check engine light will show up on your dashboard is almost always correlated with engine misfires. A misfire means that the engine is dumping uncombusted fuel into your car`s exhaust system. Engine misfire is a serious issue because it can quickly raise the temperature of the catalytic converter.
While the check engine light can definitely be indicative of serious problems, the most common cause of the flashing is usually an engine misfire. There are many reasons why an engine misfire might be occurring. To run smoothly, an engine must be receiving the correct amount of power from the cylinders in your vehicle.
A solid check engine light indicates a problem that needs to be addressed but is typically not urgent. A flashing check engine light indicates a severe problem that requires immediate attention to avoid further damage.
All input and output engine management devices (i.e., sensors, ignition coil packs, etc.) are connected via electrical circuits. Problems within these circuits, such as damaged wiring or a loose connection, can cause engine misfires.
Yes. While the damage may seem small initially, the longer you drive with a bad oxygen sensor, the worse the damage will become. Eventually, you may experience rough idling, poor acceleration, engine misfires, an illuminated check engine light, and failed emission tests.
Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The engine may be stalling because it isn`t getting enough throttle opening.
Ignition system components, including spark plugs, plug wires, ignition coils and ignition timing are culprits as are lean air/fuel mixtures and mechanical issues within the engine. Worn piston rings, worn or broken valves and worn cylinder walls, as well as worn cam lobes can also contribute to the problem.
A failing camshaft position sensor begins losing its ability to quickly transfer data. Mismatched fuel delivery and ignition timing, even if off by a few milliseconds, will cause your vehicle to sputter, accelerate poorly, lack power, stall or even shut off.
The ABS system will not cause the engine to die. You will need to have the engine scanned for any trouble codes to see the reason you are having the engine stall.
Bad solenoid may be causing vehicle to stall.
Automatic transmission vehicles need to manage their level and pressure of transmission fluid when the car is idling. They do this with a component called a torque converter. When this converter fails, your engine will stall.
The most common reason is that the engine is misfiring. When the engine misfires, it doesn`t run as smoothly as it should and can cause the car to shake. Another possible reason is that the spark plugs or ignition coils are dirty or damaged. This can also cause the engine to misfire and shake.
One of the most common causes of jerky acceleration is a dirty fuel injector. Your fuel injectors are responsible for pushing fuel into your engine`s cylinders. This means they control the timing and amount of fuel used to keep your engine running.
Worn and old spark plugs, spark plug wires, and ignition coils are common causes of random misfires. Replacing worn and old parts is part of regular maintenance for any car and should be done if needed (hopefully proactively to avoid misfires). After replacing the faulty plugs, wires and or coils, recheck for misfires.
A Blinking Light is Bad

In most cases, a check engine light will shine steadily, a serious reminder that something is amiss in your vehicle. If the light is blinking, however, your minor annoyance and concern just got elevated. If the check engine light is blinking, get to the nearest trustworthy mechanic you know.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Could this cause ur car to stall in warmer weather? My car never stalls during winter months. But from spring on its a neverendin
ANSWER : You should have the check engine light and engine scanned to see if the engine may be running lean due to low fuel pressures or clogged injectors. You should also have the mass airflow sensor cleaned and checked for proper readings and replace if not within specifications. The vehicle runs richer in colder weather and may be the reason for not stalling. You should clean injectors, clean throttle body and idle control valve then clean mass air sensor and relearn idle.

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My car idles kinda rough, and it stalls when I come to complete stop and stalls when I let it run.
ANSWER : Failures in the charging circuit (alternator, etc.) do not typically cause a rough idle. A faulty throttle position sensor and/or clogged fuel injectors can cause the engine to run roughly but those are just two among many, many potential causes of a rough running engine. What will help you is a rough idle diagnostic during which the individual cylinder firing patterns can be evaluated on a scope. Those firing patterns will allow the mechanic to see if perhaps there is "a" or a couple bad cylinders and also whether the engine is experiencing a fuel system versus ignition system problem and in which cylinders. On an engine with so many miles, 240,000 in your case, compression should be tested in each cylinder as wear in the engine could potentially cause enough imbalance, from cylinder to cylinder, to cause the engine to run roughly. You have to keep in mind that typically there will be multiple issues with an old engine, for example you could have dirty fuel injectors, a sticky EGR valve and fouled plugs due to the inevitable leakage from old valve stem oil seals, or any of a number of other combinations. The best thing to do, to see if you can get additional service life out of the engine, and you likely can, is to methodically and carefully go through the list of possibilities. YourMechanic certified technicians specialize in just that so if you set up a diagnostic, a technician will get to the bottom of this for you and give you repair options so that the engine can be restored to reasonable operating condition.

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Misfire, but ignition coil is good so what could be causing this? 2004 Dodge RAM 1500
ANSWER : Hi there – there are several possibilities for your misfiring engine: the new coil is bad as well (moving the coil seems to have moved the problem?), oil or debris in the spark plug recess that is causing shorting between the plug and block, or an incompatibility between the plugs and the engine combustion chamber. (Some engines don’t tolerate multi-electrode designs and misfire.) I would recommend a misfire inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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What could be the causing loss of power while accelerating leading to engine stalling? 2011 Chevrolet Aveo
ANSWER : Hi there – based on the symptoms you describe, I suspect that either the throttle position sensor or the fuel pump (or fuel pump relay) are failing. The result is either incorrect throttle position reported to the engine computer, or inadequate fuel pressure to fire the injectors. I recommend a car is stalling inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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I put the wrong key in my car and a few weeks later my car just shut down and it will not start I believe it’s the computer but…
ANSWER : Hi there. What had happened is the wrong key set the security to the vehicle. This is to prevent the vehicle from starting with the wrong keys. Try removing the battery cables (+) and (-) for 13 minutes. During that time, put the original key in the ignition and turn it on. Activate everything in the car even though there is no power. Then remove the key and hook up the battery cables. The computer should have reset and reset the security. If the security is still being tripped, then I recommend seeking out a professional, such as one from Your Mechanic, to help you

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Can a dead battery cause my engine to stop working?
ANSWER : A dead or internally shorted battery can not only cause a car to stall but it will also overload the alternator as the alternator attempts to both charge the dead battery and supply the car’s electrical needs. The battery can be load tested to understand its condition but if the battery is more than 5 years old there is no need to do that test as the battery would be past its normal service life. If you need a battery, you can request battery installation during which the mechanic will also test the alternator to be sure that a faulty charging system was not the cause of your dead battery. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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Car stalls all of a sudden for no reason while driving
ANSWER : Hello there, thank you for asking about your 2003 Ford Taurus. Your fuel pump in the fuel tank is most likely going bad and will seize up when it gets hot. Have the fuel pressure tested to see if you have lost fuel pressure when it stalled, then have the fuel pump and filter replaced. Make sure to check the bottom of the fuel tank for any metal particles and have the tank cleaned out of any debris found that may damage the new pump. If you want the help of a certified mechanic, have a technician from YourMechanic replace your fuel pump or fuel filter at your home or office.

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Replaced alternator on car 2 times each time shows it’s charging 14v let car run for a little bit then test drive and car voltage
ANSWER : There are reports that the replacement alternators will not communicate with the engine computer and will not charge correctly. I recommend using only the manufacturer approved replacement part. It can be new or remanufactured but approved for use in the vehicle. Some lower cost alternators on the aftermarket will have charging problems since they will not communicate with the ECM on the vehicle and will stop charging.

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