Ok im in the process of swapping my 79 malibu over to TPI. I am attempting to use the stock wiring harness. Has anyone ever done this? I would greatly appreciate a wiring diagram if anyone has one.

 

The stock harness should work well for the most part, but may require some alteration for the G-Body integration. It should plug right into the ECM from the TPI, and all the TPI engine sensors. You may have some issues at the ignition switch, brake switch, finding a VSS signal, fourth gear switch, and locating an ALDL in the old Chevy. Are you using an automatic with a TCC? EVAP canister? A.I.R. system and diverter? Air conditioning? EGR?