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There could be several causes. One of these could be it.

Open vacuum hose or hole in vacuum line. Could be even a defective power brake unit leaking.

Incorrectly adjusted idle adjustments.

Throttle stop inoperative.

Dirty carburetor.

Incorrect timing.

Bad wires. Fouling plugs.

A cylinder or two misfiring.

Many times when people work on a motor, they forget to attach the PC line to the back of the carb...cause it is hard to see.

Intake manifold leak sucking air.

Cracked manifold

Bad module in HEI

Carbon tracking inside distributor cap.

Rocker arms set too tight.

Cracked head gasket.

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13y ago

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