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What I found on my Safari with the same problem, is that the idle adjustment screw had become magnetized, so that when you let the throttle all the way off it would then stick to the screw. Replace the screw, or as I did, I just stuck a couple of little pieces of electrical tape to the plate that the screw comes in contact with. This kept the magnetism down enough to keep it from sticking.

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Q: 1999 GMC Safari Van 4.3 V6 How do you fix a sticking throttle body Only sticks coming off idle It is like the butterfly is wedged in the bore?
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