Vacuum Leak: A vacuum leak can upset engine airflow, leading to unstable idle and stalling. Check for cracks in vacuum lines, loose fittings, or vacuum leaks around the throttle body.
Clean Throttle Body: A dirty throttle body can cause idle problems. Clean the throttle body and IAC valve to restore optimal airflow and smooth idle.
Fuel Pressure: Low fuel pressure could lead to initial idling and stumbling.
Ensure the fuel pump is functioning correctly, and the fuel filter is clean.
Fuel Injector Issues: Clogged or malfunctioning fuel injectors can disrupt the fuel delivery, affecting idling and causing stalling. Consider professional injector cleaning or replacement.
Air Filter: A dirty or clogged air filter restricts airflow, impacting engine performance and leading to low idle and occasional stalling.
Spark Plugs and Wires: Check the condition of spark plugs and spark plug wires. Worn or damaged spark plugs or wires can result in rough idle and stalling.
EGR System: A faulty EGR system can influence engine vacuum, leading to low idling and increased idle after some driving. Consider checking the EGR valve for proper operation or potential replacement.
Professional Diagnosis: If the problem persists after inspecting and performing the above checks, consider taking the vehicle to a professional for additional diagnostics and repair.
