Installed a new set of plug wires two weeks ago but car still has surging and bad hesitation issues. Every sensor has been replaced since. Finally, took car out to dark area tonight and opened hood and found that one of the new wires is arching against the valve cover. It's a tiny spark but you can see it clearly. Since the wires are so difficult to get to on the duratec, can electrical tape wrapped tightly around the bad wire and placing the wire in a loop (plastic tube that fits around wires) cure the problem or does the wire have to be replaced?