1. Idle Air Control Valve (IACV): The IACV is responsible for controlling the amount of air that bypasses the throttle body when the engine is idling. If the IACV is faulty or dirty, it can cause the engine to idle erratically or die when coming to a stop.
2. Throttle Position Sensor (TPS): The TPS is responsible for sending a signal to the engine's computer (ECU) about the position of the throttle butterfly valve. If the TPS is faulty or out of adjustment, it can cause the ECU to send the wrong amount of fuel to the engine, resulting in a rough idle or stalling.
3. O2 Oxygen Sensor: The O2 sensor is responsible for monitoring the oxygen content in the exhaust gas and sending a signal to the ECU about the air-fuel ratio. If the O2 sensor is faulty, it can cause the ECU to send the wrong amount of fuel to the engine, resulting in a rough idle or stalling.
4. Vacuum Leak: A vacuum leak can cause unmetered air to enter the engine, which can lean out the air-fuel mixture and cause the engine to run rough or die.
5. Fuel Pressure: Low fuel pressure can cause the engine to run lean and stall. A faulty fuel pump, clogged fuel filter, or leaking fuel injector can all cause low fuel pressure.
6. Ignition System: A faulty ignition coil, spark plugs, or spark plug wires can cause the engine to run rough and die.
To properly diagnose the issue and determine the exact cause, it is recommended to have the vehicle inspected by a qualified mechanic who can perform diagnostic tests and make any necessary repairs.
