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Grab the shaft on the throttle body and wiggle it around and see if it has a lot of side to side slop.
If it does then what is probably happening is once it has manifold vac it pulls down on the throttle plate and it binds. I think you can have a maching shop put a bushing in it just like a carb.
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Grim-Reaper
70 Pontiac LeMans Sport Convertible, worlds longest resto in progress
Looking for 71-72 2wd Blazer or Jimmy Project
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