Ok changed from 3.8 auto to 5.0 manual .Got complete 5.0 car that was junked minus trans.Changed motor plus wireing harness plus computer the car ran great but auto trans would not shift. Bought an auto computer #W4HO off ebay and installed yesterday now car will hardly run, but trans shifts. Is a 94 Mustang an used 94 parts and ideas would be greatly appreciated.