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 supply ^ Check fuel supply



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, throttle body base and gasket