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Most likely is that the cap, wires, coil are wet. Remove the cap, rotor, and wires, including the coil wire, and thoroughly clean them. I've been known to toss 'em in the dishwasher when wife wasn't looking -- works like a charm. However, you must be sure that they're completely free of soap and thoroughly rinsed. And thoroughly dry.
You can wash down the coil tower with cleaner or Windex, but then be sure to rinse, rinse, rinse with clean, clean, clean water. And dry, dry, dry.

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Don Foster (near Cape Cod, MA)
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