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, refer to ADJUSTMENT PROCEDURES

Fuel filter clogged or dirty Replace fuel filter, refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES

Float level misadjusted Perform float level adjustment, refer to ADJUSTMENT PROCEDURES

Vacuum hose/carburetor/manifold leak Check for and repair vacuum leak, retorque carburetor and manifold if necessary, refer to SPECIFICATIONS

Main metering jets dirty/incorrect size Verify correct size jets, clean as necessary, refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES and SPECIFICATIONS

Primary metering rods bent or incorrect size Check for bent rods, verify size, refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES and SPECIFICATIONS

Power piston sticking, spring missing Replace sticking piston, and or spring, refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES

Idle system passages plugged Inspect and clean idle passages as necessary, refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES

Secondary throttle valve sticking Lubricate secondary throttle valve replace worn throttle shaft if necessary, refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES, and MAINTENANCE PROCEDURES