1. Idle Air Control (IAC) Valve: The IAC valve controls the amount of air that bypasses the throttle body when the engine is idling. If the IAC valve is faulty or has a carbon buildup, it can cause the engine to stall when coming to a stop.
2. Throttle Position Sensor (TPS): The TPS sends a signal to the engine's computer (PCM) indicating the position of the throttle. If the TPS is faulty or has a loose connection, it can provide incorrect information to the PCM, causing stalling issues.
3. Fuel System: A faulty fuel pump, clogged fuel filter, or a malfunctioning fuel pressure regulator can cause fuel starvation, leading to stalling.
4. Vacuum Leaks: Vacuum leaks can cause a lean air-fuel mixture, resulting in engine stalling. Check for any loose or cracked vacuum hoses around the engine.
5. Ignition System: Issues with the spark plugs, spark plug wires, distributor, or ignition coil can affect the engine's ability to generate a proper spark, causing stalling.
6. Fuel Injector Issues: Clogged or faulty fuel injectors can disrupt the fuel supply, leading to a lean mixture and potential stalling.
7. Air Intake System: A dirty air filter or other restrictions in the air intake system can limit the airflow, affecting the engine's performance and causing stalling.
8. EGR Valve: A malfunctioning EGR (exhaust gas recirculation) valve can contribute to stalling issues.
9. Computer (PCM) Problems: In certain cases, a faulty engine control module (ECM or PCM) can also cause stalling issues.
10. Catalytic Converter: A clogged or failing catalytic converter can restrict exhaust flow and cause stalling.
Note: To accurately identify the cause of the stalling issue, it's recommended to have a qualified mechanic diagnose the problem. They can perform necessary tests and inspections to pinpoint the exact cause and recommend appropriate repairs.
