got around to asking my buddy what was up w/ his truck why it limped and it was injectors on his, the "large" leak code was causing a rail pressure drop and that caused it to limp, had i thought like that i would have know to tell you that but i wasn't using my brain lol. anyways hope this helps, there is an outside chance that it could be the cp3 or a major leak around the fuel filter but i'd say injectors is where i'd start