I think you might have to step back and start over. You need to determine what the Gry/Rd or Gry/Or, not sure the color, wire goes. I would pull the ECU plug and using continuity testing, figure out what pin it is, if any. Once you know that, then you can determine if the wiring harness is a stock harness. I say this because there is that wire on a 91-93 harness but not a 90. I mean, if it’s not a stock year harness, well there could be other issues. I could/might be wrong.