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Had my original carb professionally rebuilt witht he full monty including re-bushed throttle shafts. Unable to set idle below 1000 RPM or get smooth idle. Absoluting nothing is restricting the linkage/throttle plates from returning to a fully closed position. Throttle body passes the "light test" for being fully closed. When I put an equivalent aftermarket Holley replacement on the car runs great so I have concluded that the original carb needs to go back to the re-builder. Before I send it off, I would like some insight into what internal problem would cause these sypmtoms i.e., too much fuel through the idle circuits.
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