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SU 4 screw stumble ... is there a cure?

Kerrigan
in Carburetor Central

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The carbs on my '71 are the original 4 screw dome tops. The car stumbles off the line unless I pull the choke most of the way out. Is there an easy cure for this problem? It does it tuned or not.

They must not be tuned right if it stumbles off the line.

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