Hesitation & Poor Acceleration

*  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 EGR system.

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

*  Check Throttle Position (TP) sensor and wiring.

*  Check airflow meter or MAP sensor and wiring.

*  Check oxygen sensor and wiring.

*  Check Engine Control Module (ECM) and wiring. Engine Backfires

*  Ensure proper spark exists from ignition system.

*  Ensure ignition timing is correct.

*  Check valve timing and timing belt (if equipped).

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

*  Check EGR system.

*  Check Throttle Position (TP) sensor and wiring.

*  Check oxygen sensor and wiring. Engine Surges

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

*  Ensure proper spark exists from ignition system.

*  Ensure ignition timing is correct.

*  Check Engine Control Module (ECM) and wiring. Engine Knocks

*  Ensure ignition timing is correct.

*  Check knock sensor (if equipped) and wiring.

*  Check EGR system.

*  Check valve timing and timing belt (if equipped).

*  Check Engine Control Module (ECM) and wiring. Muffler Explosion

*  Ensure ignition timing is correct.

*  Check fuel-cut system.

*  Ensure fuel injectors and fuel pressure regulator operate correctly.

*  Check Throttle Position (TP) sensor and wiring.

*  Check oxygen sensor and wiring.

*  Check Engine Control Module (ECM) and wiring.