Idle speed: The idle speed is the speed at which your engine runs when you're not pressing the gas pedal. If the idle speed is too low, the engine won't have enough power to keep running when you step on the gas. You can check the idle speed by looking at the tachometer on your dashboard. The idle speed should be between 600 and 800 RPM. If it's lower than that, you may need to have it adjusted by a mechanic.
Fuel mixture: The fuel mixture is the ratio of air to fuel in the engine's cylinders. If the fuel mixture is too rich (too much fuel), the engine won't be able to burn all of the fuel and it will stall. If the fuel mixture is too lean (not enough fuel), the engine won't have enough power to keep running. You can check the fuel mixture by using an oxygen sensor. The oxygen sensor should be located in the exhaust manifold or pipe. The oxygen sensor reading should be between 0.1 and 0.9 volts. If it's lower than 0.1 volts, the fuel mixture is too rich. If it's higher than 0.9 volts, the fuel mixture is too lean.
Spark plugs: The spark plugs provide the spark that ignites the fuel in the engine's cylinders. If the spark plugs are worn out or dirty, they won't be able to provide a strong enough spark to ignite the fuel and the engine will stall. You can check the spark plugs by removing them from the engine and looking at the electrodes. The electrodes should be clean and not worn down. If they're worn down, you'll need to replace the spark plugs.
Fuel filter: The fuel filter removes impurities from the fuel before it reaches the engine. If the fuel filter is clogged, the engine won't be able to get enough fuel and it will stall. You can check the fuel filter by looking at it. If it's dirty or clogged, you'll need to replace it.
Air filter: The air filter removes dust and dirt from the air before it enters the engine. If the air filter is clogged, the engine won't be able to get enough air and it will stall. You can check the air filter by looking at it. If it's dirty or clogged, you'll need to replace it.
Fuel injector: The fuel injector sprays fuel into the engine's cylinders. If the fuel injector is clogged or dirty, it won't be able to spray enough fuel into the cylinders and the engine will stall. You can check the fuel injector by removing it from the engine and looking at the spray pattern. The spray pattern should be a fine mist. If it's not, you'll need to clean the fuel injector or replace it.
MAF (Mass Air Flow) sensor: The MAF sensor calculates how much air is flowing into the engine. If the MAF sensor is dirty or malfunctioning, it may not send the correct signals to the engine's computer, which could lead to stalling. You can try cleaning the MAF sensor with a MAF cleaner (available at auto parts stores) and check if the stalling decreases. If not, you may need to replace the sensor.
Throttle body: The throttle body controls how much air can enter the engine. If the throttle body is dirty or malfunctioning, it may not open properly when you press on the gas pedal, which can cause stalling. You can try cleaning the throttle body with a throttle body cleaner (available at auto parts stores) and check if that helps. If not, you may need to have the throttle body replaced.
Faulty ignition switch: In rare cases, a faulty ignition switch could also cause stalling issues. If the ignition switch is not properly providing power to the engine's electrical system, it can lead to stalling.
ECM/PCM (Engine Control Module/Powertrain Control Module): The ECM/PCM is the main computer of your vehicle's engine. If there's a problem with the ECM/PCM, it could lead to stalling. Diagnosing and fixing ECM/PCM issues usually requires professional help.
Vacuum leaks: Vacuum leaks can cause a variety of issues, including stalling. Check for loose or disconnected vacuum hoses and replace them if necessary.
If you've checked all of these things and your car is still stalling, you should take it to a mechanic for further diagnosis.
