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You should just replace all the wires if there is a question about spark getting to the plugs. Also, how old are the plugs? It is possible that the one you are focusing on could have too large a gap or it could be a bad plug. Plugs are pretty cheap, so I would just replace them too.
When I was having problems, I replaced everything in the ignition system, cap, rotor, wires, plugs, supression cover, distributer cover, and coil. the engine purrs like a kitten now.
Good luck.
Sam
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1987 300E
1972 220d
2004 Dodge Ram 2500 T/D
1997 Explorer
1999 F250 V10 Guzzler
2002 Honda VTX 1800
2003 Boxer Named Sir Lancelot (Lance)
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