In terms of the IAC valve, I just replaced mine on my 1993 GT: Make sure that the part number is correct (check your local part store) sometimes between years the parts may fluctuate a bit. Also check the electrical connections for rust or damaged wires which may short out the signal between the unit and the EEC.
My 2 cents.
The RPM dial coil (behind the instrument panel) may be damaged, but I'm just speculating. I hope someone else help you with this. Sorry! good luck!
fongo
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1993 GT, MAC Fenderwell Cold Air Induction; Accel dist.,Splitfire plugs, BBK: 1 5/8 unequal length shorties, hi flow H-pipe w/ cats; Flowmasters 2 chamber American Thunder catback system, Motorsports 3-core radiator, 180º thermostat, BBK adj. clutch quad...the rest is bone stock!..but more mods to come!!
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