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carb vacuum leak

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The carbs, if they are well used, can leak at the throttle shafts. There are bushings that can be install (I've never done this).
 
Rich,

I had new bushings put in to my carb as it would not want to return to low idle, without having to get out of the car and physically push on the throttle linkage to close. I think any performance carb shop can get this done.

Turbomonte,
To find where the leak is you might try using a can of carb or brake clean and spray small amounts near areas that you suspect with the car running. If there is a change in idle, then you've found the area where it is leaking.
 
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