Surges at Steady Speed

Definition: 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

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

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