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There is no adjustment on a TBI fuel system, The Idle is controlled by the computer
You need to check the Idle speed control solenoid. You can find that on the top left rear side of the TBI housing. It screews in, and is about 4 inches long with an electrical connecter pluged into it. Also check for a vacuum leak.
If the check engine light is on then you need to scan engine with a engine scanner FIRST.
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