* Fuel injector problems: Faulty fuel injectors can cause the engine to misfire, which can lead to rough idling. Check the fuel injectors for proper operation, and replace them if necessary.
* Spark plug problems: Worn or damaged spark plugs can cause the engine to misfire, which can lead to rough idling. Check the spark plugs for proper condition, and replace them if necessary.
* Distributor cap and rotor problems: A damaged or cracked distributor cap or rotor can cause the engine to misfire, which can lead to rough idling. Check the distributor cap and rotor for proper condition, and replace them if necessary.
* Idle air control valve problems: The idle air control valve (IACV) controls the amount of air that bypasses the throttle valve at idle. A faulty IACV can cause the engine to idle too high or too low, and it can also cause the engine to stall. Check the IACV for proper operation, and replace it if necessary.
* Throttle position sensor problems: The throttle position sensor (TPS) sends a signal to the engine control unit (ECU) indicating the position of the throttle valve. A faulty TPS can cause the ECU to provide the wrong amount of fuel to the engine, which can lead to rough idling. Check the TPS for proper operation, and replace it if necessary.
* Oxygen sensor problems: The oxygen sensor monitors the amount of oxygen in the exhaust gas. A faulty oxygen sensor can cause the ECU to provide the wrong amount of fuel to the engine, which can lead to rough idling. Check the oxygen sensor for proper operation, and replace it if necessary.
