Vacuum leaks: A leaking vacuum hose can disrupt the air-fuel mixture, causing rough idling. Inspect all vacuum lines for cracks, tears, or loose connections.
Spark Plugs: Worn-out spark plugs or improper spark plug gaps can affect combustion and cause rough idling. Check the spark plugs and replace them if needed.
Ignition Coils: Faulty ignition coils may not deliver enough spark to the cylinders, leading to rough idling. Inspect the ignition coils for damage or corrosion.
Idle Air Control (IAC) Valve: A faulty or dirty IAC valve can disrupt the idle air flow, causing rough idling. Clean the IAC valve and check its functionality.
Oxygen Sensor: A faulty oxygen sensor can provide incorrect information to the engine control unit (ECU), leading to an improper air-fuel mixture and rough idling.
Fuel Injector: A clogged or faulty fuel injector can cause inconsistent fuel delivery, leading to rough idling. Inspect the fuel injectors and replace them if necessary.
Throttle body: A dirty throttle body can obstruct airflow and affect idle stability. Clean the throttle body and its components.
PCM (Powertrain Control Module): Software glitches or hardware problems with the PCM can affect engine management, leading to rough idling. Check for PCM updates or potential issues.
