Hesitation, Sag, Stumble

SYMPTOM DESCRIPTION:
Momentary lack of response as the accelerator is pushed down. Can occur at any vehicle speed. Usually most sever when trying to make the vehicle move, as from a stop sign. May cause engine to stall if severe enough.


POSSIBLE CAUSE ACTION


Secondary Wires - Check for bare wires or arching. Check secondary wire resistance.


Spark plugs - Check for wet plugs, cracks, wear, improper gap, burned electrodes or heavy deposits.


Ignition Timing - Check distributor indexing.


PCM - Check for trouble codes and proper ignition grounds.