Your problem isn't unique. If I recall wd40 was invented to displace water. We had a army surplus jeep on the farm. When things wet under the hood, it shorted out the spark. Moisture on the old spark plug wires, moisture under the distributor cab is a killer.
I have a 2007 GMC work truck with a v6, same problem. It's the old school distributor. I have replaced the OEM and 2 Auto Zone distributors and only have 75K on truck. Auto Zone distributors last longer than the OEM and all you have to do is buy one. The zone has a 5 year free replacement, can't say that about delco's.
The last time I had the same problem, I posted here and someone suggested using grease as a sealer around base of cap. So far so good. It all about dew point and relative humidity that cause condensation. Yesterday morning, temp was 67, raining, and I needed to turn defroster on. Well it fixed the problem inside cab, then after window got to 66 degrees, condensation formed on the outside of glass. Condensation has always been a problem in Indiana. Dew is simply condensation on the grass, causing grass mold.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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