This sounds like the TPS or throttle position sensor. You could try buying it at an auto parts store that you know you could return it if that wasn't the problem.
Good luck
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85GT 5.0 was CFI converted to Holley 650. Hooker full length headers, FlowMaster 2 chamber. Weiand Stealth manifold. 86 roller motor, crane 1:7:1 alum rocker arms(roller). SSI 220@.050/498 Roller cam. Summit double roller timing chain. Melling oil pump, stock bottom end. Mallory Hi-Fire ignition. Under drive pulleys. Accell coil and Ford Motorsport 9mm wires. 93'8.8 posi. 4:10s. AOD w/B&M shift kit. No figures yet, still working on it. No back seats or AC.
1989 GT Convert-- All stock w/AOD, Air Silencer removed, DynoMax Mufflers.
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