Surges at Steady Speed

SYMPTOM:
Engine power variation under steady throttle or cruise. Feels like the car speeds up and slows down with no change in accelerator pedal.

POSSIBLE CAUSE ACTION


Insufficient fuel capacity Check fuel capacity
Proceed to FUEL PUMP


Faulty fuel pressure regulator Check fuel pressure


Contaminated fuel Check for water or
excessive alcohol in fuel
Drain fuel tank and add clean fuel


Dirty fuel filter Replace fuel filter


Lean operating condition Check computer controls
Refer to COMPUTERS AND CONTROL SYSTEMS


Vacuum leak Inspect vacuum hoses for
proper routing and damaged lines
Check intake manifold and throttle chamber