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Bill, I'm trying here.
Since doing that have you remove the distributor cap to see if any loisture got in there? I don't know if you mean you sprayed a large amount of water right on the dist cap but they aren't made to take that. Did you notice where you were spraying at the moment it started? They are also supposed to have a rubber o-ring type gasket sealing the cap to the distributor. Make sure that is in tact. Your problem still sounds like one of the things in my first reply. A crack or other type voltage leakage in thhe distributor is my gut on this. A crack in the coil or distributor cap, corrosion at one of the plug wire terminals. Water accumulating in the spark plug hole will do that. If the problem is present, remove the distributor cap and use a blow dryer to completely dry everything in the cap and distributor, then drive it again. That may help isolate it.