O4 gt misfire
just bought a 04 gt three days ago and it's popping a cylinder 4 misfire and random misfire code. The shop has checked coils, compression, plugs ect and can't figure it out. Thinks it has something to do with the injector. I have bigger injectors, better coils, not sure what else because I bought it that way. Anyone have a similar problem? Should I just go back to oe injectors? Thank you.