Engine Controls - Tests W/O Codes: Symptoms: Hunting
- Check Heated Oxygen Sensor (HO2S) circuit.
- Check for intake air leaks.
- Check Positive Crankcase Ventilation (PCV) system.
- Check Idle Air Control (IAC) Valve.
- Check Throttle Position (TP) sensor adjustment.
- Check Exhaust Gas Recirculation (EGR) valve.