I did plugs and wires in the summer of 2012. I did the wires because a mouse nested under the engine cover and chewed them, so I've already had that thought and checked it out. The factory Iridiums at 120K miles still looked new, and were only a tiny bit over gap. I was tempted to keep them, but I went ahead and replaced them with new AC Delco Iridiums. I figured this way I wouldn't have to do it again.
Yeah, I don't have anything more than a code reader, but I do have a DMM. I was thinking it'd be a measure of resistance, but it might be voltage. If anyone knows for sure, I'm going to try and take a peak at it tomorrow. Maybe I'll try a wet down of the wires just to be sure.
