Hi, anybody have any ideas? 88 Mustang 5.0 converted to mass air with 89 Mustang harness. When you start it up, it instantly goes rich. We have changed the computer, maf, map, injectors, fuel rail with no change. Any help appreciated.
Not too sure if this could be it, but my car idled real rich and had the surging idle, and i changed the 02 sensors, and the TPS and this solved it.
Good luck with it.