I HAVE A 1986 IROC THAT HAS AN LG4 CARBURETED ENGINE WITH MANUAL TRANSMISSION THAT I AM TRYING TO RESTORE BACK TO STOCK. THE PREVIOUS OWNER HACKED UP THE HARNESS WHEN HE REMOVED THE STOCK CARB AND EMMISIONS. I RECENTLY PURCHASED A A COMPLETE ENGINE HARNESS AND ECM HARNESS THAT WAS TAKEN FROM A 1986 IROC THAT HAD THE LG4 CARBURETED ENGINE AND AUTOMATIC TRANSMISSION. I HAVE THE CORRECT CARB, INTAKE, AND DISTRIBUTOR FOR MY ENGINE. I PLAN JUST INSTALLING A NEW CAM (COMP XE-262) AND A SET OF EDELBROCK HEADERS THAT INCLUDE ALL THE AIR TUBES.

WILL THE HARNESS FROM THE AUTOMATIC TRANSMISSION CAR WORK PROPERLY WITH MY MANUAL TRANSMISSION CAR IF I JUST PLUG IT INTO MY EXISTING ECM AND CONNECT IT UP TO THE ENGINE? IF NOT WHAT CHANGES WILL BE NECESSARY?

 

It should work just fine.