I bought this GT from a friend that installed an aftermarket intake manifold, throttle body, tranny, oil pump & cam among other things. It was supercharged at some point and he removed it before i got it. When i bought it the AC compressor/pump was bypassed, tons of electric connectors that don't go to anything are scattered around under the hood that i know nothing about, vacuum lines are plugged in random spots such as the main line for AC and B/R aswell as plugged on the throttle bodies 90 Degree nipple that sits before the throttle plate and the nipple on the oil filler is connected to nothing nor plugged. Anyways, i've tried using a newer code reader to diagnose a check engine light awhile back and had no luck as far as gettin it to even register that it was connected to the car. I bought one of those cheap 30 dollar ford OBD1 reader and had the same problem. Anyone know what could cause no communication between a reader and the car? Or a checklist that i can run through of things to look through?