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.