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That is a plug that has been put in there from the factory to keep you from fooling with the idle screw. THE IDLE SPEED IS COMPUTER CONTROLLED AND NOT ADJUSTABLE. YOU HAVE other PROBLEMS if it won't adle right. Is the check engine light on ?? If it is then you need to have the engine scanned with a engine scanner to find out what is wrong.

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Q: There's something in the hole preventig adjustment. How do you set the idle on the throttle 1994 Chevy Suburban?
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