Originally Posted by dduelin
I don't even carry 1 new one, I just keep one of the old ones I replace with new ones every major service. After all they were working just fine when I took them out.....If I need a known good one to get home I have one. What are the odds I'll need two on the side of the road? On the other hand, a couple of times in my life I have gotten a faulty plug right out of a new box.
good thoughts on that. Carrying the extra stuff is not to do regular interval service, its there for testing and or repairing to get you home. Sometimes having a "new" part is less reliable than having a known working part.