I was getting my exhaust done the other day on my 90 GT and when i was leaving the guy said it sounding like i had a spark plug wire loose or off. he said he heard some arcing. I checked under the hood that night and i could see voltage running through my spark plug wires mainly in the place where the wires lay on top of the a/c lines. Is this normal or do i need new wires? I have a msd6al if that matters. I haven't noticed the car spark knocking under strain or anything. Thanks for your help.