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. Service and Repair

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. Carburetor Overhaul/Replacement

Idle system passages plugged Inspect and clean idle passages as necessary. Carburetor Overhaul/Replacement