It could be any # of things, computer related, Vacuum leak, weak fuel pump, lean condition from the o2s, I would check your fuel pressure and see if all your vacuum connections are on. You might need a chip for your mods, but let someone else whos run your cam tell you about that, i'm unsure. Me and my bro both have injected stangs, mine an 87, and his is in his 67 mustang on his 289, all i know he had backfiring and a chip seemed to help, mines stock so i could ask him about your problem, I live in O'Fallon so ur not far. Good luck, Justin
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