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. Testing and Inspection

Faulty fuel pressure regulator Check fuel pressure. Testing and Inspection

Contaminated fuel Check for water or excessive alcohol in fuel. Alcohol In Fuel Test

Dirty fuel filter Replace fuel filter.

Lean operating condition Check computer controls.

Plugged fuel injector Perform injector service (cleaning). Fuel Injector Cleaning Procedure

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