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My lt1 has an aftermarket wiring harness and has little power and a skip. The computer is not sending out a signal to the obd port so no scanner will comunicate with motor. I hate chasing problems and i dont know where to start. I have checked ecm wiring and spark,changed plugs and checked fuel pressure. What else is there i would like to fix my lt1 but changing intakes and using a tbi system is easier to figure out.
