Afriend installed a late model 460 in his truck with fuel injection and a 1994 computer. The engine starts but runs like crap. We show no codes. He made his own wiring harness. My question, I thought all Fords using Speed Density were SEFI, he says no this was a batch fire set up. Can anyone help or direct me to wiring diagrams? Its also possible the injectors are bad although we cleaned them. Any id4eas? Thanks for any replies.