Incorrect Idle At Engine Start-Up

*  Check for defective throttle linkage or cable.

*  Check throttle opener or dashpot (if equipped).

*  Check idle air control valve (if equipped) and wiring.

*  Check Engine Control Module (ECM) and wiring.

*  Check Throttle Position (TP) sensor and wiring.

*  Check A/C signal circuit to Engine Control Module (ECM).

*  Check park/neutral position switch signal to Engine Control Module (ECM).

*  Ensure dipstick and oil filler cap are properly seated. Engine Idle Speed Remains High

*  Check for defective throttle linkage or cable.

*  Check dashpot or throttle opener (if equipped).

*  Check idle air control valve (if equipped) and wiring.

*  Check Throttle Position (TP) sensor and wiring.

*  Check A/C signal circuit to Engine Control Module (ECM).

*  Check park/neutral position switch signal to Engine Control Module (ECM).

*  Check fuel injectors.

*  Check Engine Control Module (ECM) and wiring. Engine Idle Speed Remains Low

*  Check idle air control valve (if equipped) and wiring.

*  Check airflow meter or MAP sensor and wiring.

*  Check fuel injectors.

*  Check Engine Control Module (ECM) and wiring. Rough Engine Idle

*  Check for vacuum leaks.

*  Check EGR system.

*  Ensure proper spark exists from ignition system.

*  Ensure ignition timing is correct.

*  Ensure fuel system performs properly (fuel pump, fuel filter, fuel injector and fuel pressure regulator).

*  Check engine compression, valve clearance, valve timing and timing belt (if equipped).

*  Check airflow meter or MAP sensor and wiring.

*  Check Engine Control Module (ECM) and wiring.

*  Ensure dipstick and oil filler cap are properly seated. Engine Misfires

*  Check EGR system.

*  Ensure proper spark exists from ignition system.

*  Ensure ignition timing is correct.

*  Check engine compression, valve clearance, valve timing and timing belt (if equipped).

*  Check fuel injectors.