I have a '86 TPI system and the throttle will sometimes hang open just a little. Without the engine running the throttle rolls fine always going back to the set screw. While running (either at idle or driving)if you hit the gas pedal the throttle will not come all the way back to the set screw causing a high idle.You either have to roll it back by hand or tap the pedal. I checked the cable and its fine.Also no carbon or anything in the throttle body.
Could it be the throttle position sensor? [img]graemlins/clonk.gif[/img]