Surges and/or Chuggles

SYMPTOM DESCRIPTION:
This condition occurs when; engine power varies under steady throttle or cruise. Feels like the vehicle speeds up and slows down with no change in the accelerator pedal.


POSSIBLE CAUSE ACTION


Voltage Output - Check for proper secondary output voltage with spark tester.


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.