I worked on a tbird with a similiar problem, idled very high and wouldnt come down. Turned out it was the IAC, the spring went weak and the engine vacuum was sucking it open. It set a code but didnt set the check engine light. Try unplugging the IAC while the car is running if it continues to idles high youve found your problem. Hope this helps.
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'95 GT convert. K&N, C&L mass air meter, Performance distributors sreamin demon coil, dyna mod, live wires, king cobra clutch, flowmaster american thunder exhaust, UPR billet adjustable shift handle, Crane Cams Fireball HI-6 box,underdrive pullies, 255lph fuel pump, UPr short throw shifter, caster camber plates, 03 cobra lower A arms, bullit suspension, cobra front brakes
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