Try swapping the coil pack with a different cylinder. If it still does it youve eliminated the coil pack. I would say try this same thing with the injector but you said it was still fueling. If you ran hard wires to everything for that circuit and it is still doing the original problem it will have to be failure of a part and not in the wiring im guessing but its very hard to diagnose things like this without seeing/putting my hands in the vehicle.
23:42:25 12/28/12
