ok so truck runs with the bypass wire plugged in but around 2k rpms and 4k rpms it spits and sputters in between its fine. i dint have an o2 sensor hooked up. could it be the o2 or plug wires or plugs. also could it be my cam? cam is lunati voodoo 437-454 lift 250-256 advantage duration. important running it on stock ecu no chip