The engine light has been on in my 89 coupe ever since I bought it, and I decided to change my O2 sensors to see if that was the cause. It's been running rich and its been chugging gas like crazy. When I bought the new O2's the the wire harness was different and didn't fit. My buddy had an O2 out of his 86 GT and it matched. I checked all of the wiring and it seems that the wires starting around the mass air, going to the O2s are out of another car. As if that wasn't enouph, I tried pulling codes and the computer won't talk to me at all. Could all of this be caused by the O2s and wiring or is there a way to test the computer to see if that is bad too?