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

Restricted air cleaner - Replace air cleaner element

Idle speed and mixture misadjusted - Perform fuel mixture and idle adjustments.

Fuel filter clogged or dirty - Replace fuel filter.

Float level misadjusted - Perform float level adjustment.

Vacuum hose/carburetor/manifold leak - Check for and repair vacuum leak, retorque carburetor and manifold if necessary.

Main metering jets dirty/incorrect size - Verify correct size jets, clean as necessary.

Idle system passages plugged - Inspect and clean idle passages as necessary.