Originally posted by Vandy420a
a mechanic prob won't be able to see it any better than you on the wires, damn I really wish I could find this link about how to tell---basically it looks like a small white pinhole in the plug wire boot--the part that attaches to the plug...this is an indication of moisture (often not visible to the human eye) that is causing arc-ing

http://www.magnecor.com/magnecor1/techbulletins/tech_mrbishi1.htm ;)