* Idle Air Control (IAC) Valve: The IAC valve regulates the amount of air that bypasses the throttle body when the engine is idling. A faulty IAC valve can cause the engine to stall at idle, especially when coming to a stop after driving at higher speeds.
* Throttle Position Sensor (TPS): The TPS monitors the position of the throttle valve and sends a corresponding signal to the engine control unit (ECU). A faulty TPS can provide incorrect information to the ECU, causing the engine to stall.
* MAF or MAP Sensor: The Mass Air Flow (MAF) sensor or Manifold Absolute Pressure (MAP) sensor measures the amount of air entering the engine. Incorrect readings from either sensor can affect the air/fuel mixture and cause stalling.
* Fuel Pressure: Low fuel pressure can cause the engine to stall, especially under load (like when slowing down for a stop light). Check the fuel pressure regulator and fuel pump to ensure adequate pressure.
* Vacuum Leaks: A vacuum leak can cause a lean air/fuel mixture and engine stalling. Inspect the vacuum hoses for cracks or disconnections.
* Faulty Ignition System: Issues with the ignition system, such as faulty spark plugs, ignition coils, or distributor (if applicable), can lead to misfires and eventual stalling.
Please note that it's essential to properly diagnose the problem to identify the exact cause before attempting any repairs or replacements. If you're not comfortable doing so, seek help from a qualified mechanic.
