I spoke to my mechanic who is getting ready to put a bullet in my '90 GT. Apparently, the only way to be able to run codes or get the computer to come to life is by manually grounding some kind of signal return wire or something like that. Sorry, I wrote it down and left the info at home. Does this sound like it rings a bell with any of you gurus out there? Also, when the cluth pedal is depressed and released, my mechanic also indicated that the idle will fluctuate. Anybody?