My van wont start when it rains, it turns over but wont catch on 1997 Dodge Ram Van 2500

everytime it rains

Asked by for the 1997 Dodge Ram Van 2500
I had a dodge van and it wouldnt start in wet weather I just sprayed the cap and wires with wd40 and it would fire right up
1 more answer
i would replace the cap rotor and wires as they are arcing out causing the no start.

Roy