Wiring harness
 

So I have a 2003 F450 that has a real bad Miss is it an injector or the harness the code reader produces a code that I can't find anywhere p2200 I can't find that anywhere a little help please

P2200 isn't a valid code. Could also be a FICM issue.

You could do a wire continuity test. Lots of threads on it in various forums.

You could swap the injector w/ another and see if the code follows it. That would identify if it were really the injector.

You could also send in the FICM and have it tested (I would use FICMrepair.com).