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Originally Posted by goodwrench1984
If the throttle shaft is worn excessively, then the carb should probably go to a rebuilder. If you know anyone who works at a GM dealer, some one there probably knows how to rebuild them, and can give you good advice. Good luck with it.
Chris
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Good point Chris. Don, he is talking about the lower most plate closest to the manifold, if the shaft is worn exessively then you have an air leak that adversely affects the carburetor operation, on old carbs they just run lean, on newer carbs with sensors on the engine it might make the carb run rich but don't quote me on that. At any rate Chris is right. If you do decide to rebuild the carb like Texasred said then I would also add that you could take LOTS of pictures to help you re-plumb all the vaccum and electrical connections when you are done. Good luck.