When pressing gas pedal car starts to shake then stops when i let go

While driving i hit gas pedal and car shakes while driving

My car has 135000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello, thank you for writing in. Due to the occurrence of your symptoms being related to the acceleration of the vehicle, it is likely that the vehicle is misfiring for one reason or another and causing an engine vibration. Misfires are commonly associated with poor fuel pressure/injection, mistimed or weak spark, or poor airflow. With that being said, you are in a position of needing to do some further testing. Start by checking for proper spark. If the ignition system is working, then you will want to turn your attention to the fuel system. The best way to do this is to test your fuel pressure. If low, you need to replace your pump or filter. Also check the air intake and make sure the ducts and filter are clean. The air intake sensors can also cause these issues. For more help with diagnosing the issue, contact our service department to schedule an appointment.

How to Identify and Fix Common car Problems ?

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Typically when you accelerate and the engine or steering wheel is vibrating, it`s due to motor or engine mounts being worn out. During acceleration, the motor mounts the engine vibrates naturally as RPM`s increase. Engine mounts are the component responsible for securing the engine of a vehicle to the chassis.
Typically it`s from a damaged inner CV joint. These are located on the end of each axle. They both have an inner and outer joint that could be damaged and shake when you press the gas pedal. Another cause could be a broken motor mount.
Shaking or vibration 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.
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.
The only fix is to completely replace the CV joint. The main purpose of motor mounts is to attach a car`s engine to the frame of the vehicle. A secondary purpose is to dampen or reduce engine vibration so the occupants of the car don`t feel the constant shaking or vibrating of the engine while it`s running.
Low automatic transmission fluid can cause shaking. If the shaking is accompanied by the check engine light, it`s time to visit a mechanic. Drivers of manual cars might discover their clutch master cylinder is the source of the shaking.
Improperly functioning spark plugs cause an uneven burn of fuel in the engine, resulting in fluctuating RPMs and a louder noise. You might also experience increased vibrations of your vehicle while sitting idle or while traveling at low speeds. These vibrations originate from the engine and can shake the entire car.
Vibration While Driving. Because the CV Axle joints are located right next to the vehicle`s wheels, any damage to them can directly affect your driving. If you suddenly feel as though your vehicle is vibrating more than normal, it can mean that you have a damaged halfshaft.
You usually notice your car shuddering because it feels like it`s vibrating. Your car will vibrate even when you`re not going very fast. The shuddering makes the car lag and is very noticeable. Some vehicles have a transmission temperature indicator that will let you know when your car`s transmission is overheating.
Engine Problems

There are a few parts within a vehicle`s engine that could cause a car to shake if they malfunction. These include the spark plugs and engine air filter. Check the spark plugs and their connections.

Automatic transmissions that shift hard, jerk or shake during a shift change may mean your transmission fluid needs changed or fluid level is low. In manual transmission vehicles, abnormal gear shifts could indicate damaged gear synchros, worn clutches or other, more severe issues.
If your spark plugs are dirty or worn, your vehicle will shake when you`re stopped. Dirty or worn plugs misfire because they cannot ignite the piston cylinder fuel properly. Thankfully, new plugs aren`t that expensive.
One common cause of shaking while idling can be loose engine mounts. Engine mounts are the connections between your engine and your car — they keep your motor safely attached while dampening vibrations produced by your engine.
One common cause of shaking while idling can be loose engine mounts. Engine mounts are the connections between your engine and your car — they keep your motor safely attached while dampening vibrations produced by your engine.
Your car shakes when decelerating mainly due to warped rotors, worn brake pads, or bad engine mounts. It could also be due to a variety of other issues ranging from unbalanced tires, worn tires, worn wheel bearings, bad suspension, and bad CV joints, among others.
One common cause of shaking while idling can be loose engine mounts. Engine mounts are the connections between your engine and your car — they keep your motor safely attached while dampening vibrations produced by your engine.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Car almost stalled, steering wheel locked up, all lights on dashboard came on, pushed gas pedal and nothing happened.
ANSWER : Hi there. When the engine is stalling and sputtering, this is an indication that the fuel system has lost pressure. Check the fuel pump relay and see if it is hot and if its clicking on when the key is turned on. If the relay is hot when the engine stalls or sputters, then there is an issue with the wiring to and from the fuel pump or the fuel pump maybe weak. For the steering column to lock up, the locking solenoid in the steering column losing power when the engine stalls. This could be an issue with the ignition switch as the solenoid is energized with the key turning in the ’ON’ position. The shaking could be either the brake rotors are worn causing the shaking when the brakes are applied or if the brakes are not applied, then the CV Shafts could have a joint that is felt when loaded when coasting. I suggest checking out the rotors, CV Shafts, the fuel pump relay, and the ignition switch. If you need further assistance with your engine stalling, shaking, and sputtering, then seek out a professional, such as one from Your Mechanic, to help you.

When I press the gas pedal the engine revs but the car doesn’t accelerate. Is this a throttle or transmission issue?
ANSWER : Hi there. From what you are saying it sounds like there is a failure in the throttle body. When the motor in the throttle body fails, the throttle plate will open and close causing the noise you are hearing. I usually monitor the movement of the throttle to see if this is what is occurring. I then scan the computer for codes to see what comes up. If there are not any codes then the sensors in the throttle body should be monitored to see what is going wrong. If you want to have this lack of throttle response checked, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair your throttle body issue.

My car has been stalling then my gas pedal goes to the floor and wont go. I try to start it again, it’s smoking and car is shaking 2000 Oldsmobile Intrigue
ANSWER : Hello – your symptoms suggest that the head gasket(s) are blown on your engine, and coolant is leaking into the cylinders – hence the white smoke from the exhaust. Blown head gaskets can also cause misfire rough running, and low power levels. You don’t mention overheating, but an overheating event could be that cause of blown head gaskets, or just high mileage on this particular engine. I recommend a car is stalling inspection performed 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 a cost estimate for repairs.

My car will not start Intermittently. I purchased a new battery 2 weeks ago and yesterday the car wouldn’t start. Got a jump and
ANSWER : The issue you are having is probably due to an intermittent fault in the starter motor itself or a deficiency in the starter electrical circuit, for example a large voltage drop due to a poor ground or a high resistance connection. These issues can be readily diagnosed and resolved on a mobile basis if you request a hard starting diagnostic. If you request that diagnostic, the responding certified mechanic will get this resolved for you promptly. Based on Toyota’s Factory Service Manual, the battery should not be disconnected if the vehicle engine is running. The battery acts as a large resistive voltage sink and consequently taking the battery out of the circuit, while the alternator is still running, can create a voltage spike on the car’s electrical system which is not good for voltage sensitive components such as the engine computer. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Stop at stop sign, give it the gas, it want go, let up, push down agin it goes,the engine does not die.!!!!
ANSWER : What you are describing sounds like a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. This is also an important function when starting the motor as it allows the motor to run and idle on it’s own once the motor fires. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed with the help of the idle air control valve making the transition from a higher RPM back down to idle speed while adjusting the air/fuel ratio constantly to allow this to happen smoothly. When the engine RPM drops below the normal range of about 800 RPM, this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

Shifting from 2nd to 3rd, car stopped going fast. Now it won’t go at all.
ANSWER : It is possible that your clutch has failed. The sound you are hearing is likely due to the clutch not engaging with the engine due to it being worn. I would recommened having your transmission inspected by a qualified transmission expert to determine if your clutch requires replacement in order to resolve this issue. This inspection may require removal and partial disassembly of the transmission in order to verify that the clutch has failed.

When pressing gas pedal car starts to shake then stops when i let go
ANSWER : Hello, thank you for writing in. Due to the occurrence of your symptoms being related to the acceleration of the vehicle, it is likely that the vehicle is misfiring for one reason or another and causing an engine vibration. Misfires are commonly associated with poor fuel pressure/injection, mistimed or weak spark, or poor airflow. With that being said, you are in a position of needing to do some further testing. Start by checking for proper spark. If the ignition system is working, then you will want to turn your attention to the fuel system. The best way to do this is to test your fuel pressure. If low, you need to replace your pump or filter. Also check the air intake and make sure the ducts and filter are clean. The air intake sensors can also cause these issues. For more help with diagnosing the issue, contact our service department to schedule an appointment.

Car starts, shakes then Dies out within seconds!
ANSWER : Hi there. The dreaded rotten egg smell is caused by either a clutch that is damaged or the catalytic converter that needs to be replaced. I would recommend before you take your car to any repair facility or attempt any repairs; first have a professional mechanic come to your location and complete a car starts then dies inspection. This will allow them to pinpoint the source of your issues and recommend the right repairs.