No check engine light, stalling while driving

Was stalling out previously at a complete stop, oil pressure gauge would go to 0. Cleaned throttle body and sensors out and pressure gauge went back to normal but now it's stalling in drive while moving.No check engine light and diagnostic test didn't catch anything so it's not a sensor. once it stalls, it won't start right back up, but give it a few minutes and it will start. Thanks

My car has 90000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello,
It sounds like you may have a dirty or faulty idle air control valve. In some cases this may not always set the check engine light off when this is dirty. The idle air control valve is a small valve on the engine’s intake system that reads the air intake as it comes into the motor. This is controlled by the car’s ECM which uses this information to make adjustments to the air/fuel ratio depending on various inputs such as outside air temperature, intake air temperature, load and various other things. As you accelerate, your car’s engine is receiving a much higher dose of fuel than when at idle and conversely, when you let off the gas pedal, there is a sudden change in this fuel supply as a result of your foot letting off the pedal. When this happens, the job of the idle air control valve is to bring this deceleration down to a slow and smooth idle rather than suddenly cutting off the fuel supply causing the motor to die. When the idle air control valve is not working properly, this cause a disruption in this process resulting in the engine not being able to idle properly.

The other possibility may be a faulty ignition coil which may cause it to not want to start back up immediately. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeatedly The insulation develops small fractures that open when heated and close when cooled. When open, they allow shorting of coil windings and decrease or eliminate the coil’s ability to function. This type of temperature cycling happens because every time you shut the engine off, the fan stops running, the coolant stops flowing and the temperature under the hood rises. Every time you start the engine again the coolant flows, the fans turn on, and the temperature drops. When this heat dissipates and is absorbed under the hood, it is trapped causing this cycling effect. In either case of the engine shutting down, this will cause the oil pressure gauge to read 0 when the engine is not running and therefore not creating any oil pressure. I would recommend having a professional come to your location to diagnose and inspect your vehicle.

How to Identify and Fix Common car Problems ?

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

If an engine starts and runs OK for a few minutes, then stalls, the problem is likely a buildup of exhaust backpressure that is strangling the engine. The cause is usually a plugged catalytic converter, but you should also inspect the pipes to see if any are crushed or kinked.
The most common reasons a Jeep Wrangler engine stalling are the fuel system, the air intake system, or the ignition system.
The most common sensor which can lead to your car stalling is the manifold absolute pressure sensor (MAP) or the mass air flow sensor (MAF). Most cars typically have one or the other.
Immediately turn on the vehicle`s hazard warning lights. They`re the universal sign of distress. If you`re unable to pull completely over onto the shoulder, or if the car is stalled in a traffic lane, do not attempt to get out of the car! Similarly, never try to cross a highway on foot.
There can be multiple reasons. Electrical parts wearing out is common – bad plugs, bad ignition coils, bad battery, bad alternator, bad plugs, bad plug wires, etc. Fuel system problems are also a common cause of this – bad fuel pump, clogged lines, clogged filter, bad gas (fresh gas and a gas treatment will fix that).
Electrical components – problems with malfunctioning control modules, fuses, wiring, or sensors can cause the engine to stall without proper power and communication with other modules throughout the car.
If your car`s transmission has an internal pressure problem, it can cause the torque converter to lock up, causing your car to stall. Though not as often the culprit of engine stalling than others, the transmission shouldn`t be overlooked when searching for the root cause.
Stalling most often occurs because of a problem with the air to fuel ratio inside of the vehicle`s engine. Leaky air intake tubes, a dirty air filter, or various other airflow issues can potentially disrupt the air to fuel ratio and cause the vehicle`s engine to stall.
Will a bad O2 sensor cause rough idle and loss of engine power? You bet. Moreover, you may also notice poor acceleration, engine misfires, and even stalling. Bad oxygen sensors disrupt all kinds of essential engine functions, including engine timing, combustion intervals, and air-fuel ratio.
Stalling Engine

This, too, is a sign that you`ve got a problem with the MAF. Because the MAF measures the air that flows into the engine, it can actually cause the ECM to make changes to the air and fuel mixture that will cause your engine to stall if it`s sending incorrect air readings.

If the vehicle randomly shuts off while driving or stationary, there is usually an issue with the engine. Typical patterns here are issues with the ignition system, mixture preparation or fuel. A known error here is that the vehicle was refueled with the wrong type of fuel.
Many modern vehicles are designed with several fail-safes to help protect the engine in adverse conditions. One of this is an automatic shutoff when the oil pressure drops to a certain level, or the oil level drops too low (note that this is not true for all cars). This causes the engine to stall and die.
Bad solenoid may be causing vehicle to stall.
Engines use a timing belt or chain to sync the different functions of certain parts and make sure that it runs smoothly and efficiently. When a timing belt or chain is starting to wear out or has been damaged, it can skip a tooth (or several), and this will cause the engine to stall.
Incorrect Engine Timing

As we said in the introduction, engine timing can make your vehicle stall. Your spark plugs are part of your engine`s timing. They detonate the air and fuel mixture in the cylinders. If their timing is off, your engine`s detonation will be off, and this can cause stalling.

When your vehicle splutters and eventually stalls it could be a sign that your car needs new spark plugs. The spark plugs, while small, are a critical part of your engine and are what “spark” air and fuel mixture in the engine sending power through your vehicle.
If there are contaminants or water in the fuel, a misfire can occur. That is when the spark plug isn`t able to fire or the fuel in the engine isn`t able to burn. It can cause a stumble, or can cause the engine to stall if it happens consistently.
Stalling the car extremely frequently especially with load(passengers) can put additional stress on the transmission components but again its highly unlikely you will kill the car with stall.
Malfunctioning spark plugs can make an engine stop for a while and resume its normal functioning. It can happen when you are driving. The engine can also sound rough when idle. The misfires affect the proper functioning of your car`s engine due to failing spark plugs that have no power to ignite the fuel-air mixture.
Another symptom commonly associated with a problematic crankshaft position sensor is intermittent stalling. If the crankshaft position sensor or its wiring have any issues, it can cause the crankshaft signal to be cut off while the engine is running, which can cause the engine to stall.
The signal from the coolant temperature sensor tells the engine`s computer when to apply extra gasoline during a cold start. A faulty sensor can confuse the computer, keeping it from providing enough fuel. As a result, the engine may hesitate or stall.
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. Your engine needs air to run properly as well.
Faulty EGR Valve

Common systems on a failed valve will include poor performance, poor running, excess smoke or stalling engines.

EGR Fraction Based Control

Critical sensors are an exhaust manifold pressure sensor (P2), an intake manifold pressure sensor (P2) and a speed density estimate of total mass flow. Exhaust and intake manifold pressures are used to control the EGR valve and VGT vanes.

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