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No best answer has yet been selected by banana. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.New plugs can be faulty, like any other mechanical device, but it is rare. I think I would suspect the plug leads, when the problem is occurring, whip out the plug thats misfireing and swap it into another cylinder, does the problem move with it or stay in the same pot?
Plug leads do break down internally with age, and can cause these symptoms.