I have had wires go bad. At night, in the dark, you can see the wires arc to the motor or other grounds. I had a light show under the hood.

Beware of aftermarket wires: THe OEM have a threaded end that the stripped wire feeds into. It is crimped onto the end of the wire before the plug cap is screwed on. I bought a set that were made up by a supplier using all OEM Parts, but the ends were not stripped or crimped. They are crap. Even though they are OEM ends and specs, they are not good quality. Save your headaches and buy factory parts or make them up yourself (From factory parts). Next time, that is what I will do.

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Steve
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si