* Idle Air Control (IAC) Valve: The IAC valve regulates the amount of air that enters the engine while idling. If the IAC valve is faulty, it can cause the idle speed to fluctuate and eventually stall the engine.
* Throttle Position Sensor (TPS): The TPS sensor monitors the position of the throttle plate and sends a signal to the PCM (Powertrain Control Module). If the TPS sensor is faulty, it can send an incorrect signal to the PCM, causing the idle speed to fluctuate.
* Vacuum Leak: A vacuum leak can also cause the idle speed to fluctuate. If there is a leak in the vacuum system, it can cause the engine to run lean and stall.
* Fuel System: A dirty fuel filter, faulty fuel pump, or clogged fuel injectors can also cause the engine to idle roughly and stall.
If you are experiencing this problem, it is best to have your car diagnosed by a qualified mechanic. They can pinpoint the exact cause of the problem and recommend the best course of action for repairing it.
