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, refer to FUEL SYSTEM DIAGNOSIS

Faulty fuel pressure regulator Check fuel pressure, refer to FUEL SYSTEM DIAGNOSIS

Contaminated fuel Check for water or excessive alcohol in fuel, refer to ALCOHOL IN FUEL TEST, drain fuel tank and add clean fuel

Dirty fuel filter Replace fuel filter

Lean operating condition Check computer controls, refer to COMPUTERIZED ENGINE CONTROLS

Plugged fuel injector Perform injector service (cleaning), refer to MAINTENANCE PROCEDURES

Vacuum leak Inspect vacuum hoses for proper routing and damaged lines, check intake manifold/throttle body area