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a simple check is wd40.. spray it on the plug cap.. well you can spray the entire wire if you like.. basically if the wires/cap are old and have very fine cracks the spark will ark to from the wire/cap to the cylinder head and not across the spark plug. the WD40 is a fine oil that fills all the cracks and basically seals it all back up again. if it fixes it you need new wire/cap as this fix doesn’t last for long. it's an old mechanics trick from the time when cars/trucks had distributor caps.. "my car won't start when it rains" spray the 40D and it purrs like a kitten.. for a day or two

one last comment.. make sure there is no visable water (pooled) in the hole.. or nothing will work
 
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