Hello Im having lots of trouble with my wiring on my 1990 Mustang and I am hoping someone on here can shed some light. The original ECM is fried and I have been working on this car for two weeks trying to figure out what the problem is with the wiring harness I happen to have a 1988 speed density car with everything that is still good I know that mass air flow is definitely better but I'm tired of this and I really just want to get the car running it's just a driver can I switch my 90 to an 88 speed density setup without a lot of problems someone please help if you can