i just swapped out my 97 ls for a 00 gsr. engines in and everything but it doesn turn on. after breakin my balls tryin to figure out what was up, i came to the conclusion that the gsr ecu i have doesnt fit on my harness. since my car was a 97 ls its ecu was a p72 obd2a, but my gsr ecu is a p72obd2b. as a result the plugs into the harness are different. and the gsr one doesnt fully connect. anyone got a solution?