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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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