RE: 2001 RAM 1500 won't start when damp
You don't say how old the plug wires are, but I would check those as well. My brother used to have problems with his Volare in the 1980's. On very humid midwest days, that car wouldn't start. The old, brittle plug wires meet too much resistance with moisture in the air. Like you, if it rained, he was screwed. When all of the ingition components were replaced, it was like a new car.