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These is a little metric set screw on the semicircular cam at the end of the throttle cable. It has a locknut that will need to be loosened for the adjustment. -On my geo, there is a flat-head screw on the intake manifold, right next to where the hose is connected from the airbox. Simply turn it right or left to adjust your idle. Hope that helps-

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15y ago
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Q: How do you adjust the idle on a 1991 Geo Prizm?
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