Another thing that frequently happens is water intrusion under the distributor cap. Luckily, there is an easy fix for this if you happen to be carrying a can of WD40—also known as Water Displacement fluid batch 40. That’s right, WD40 is named for what it does—displacing water. Pull the distributor cap and spray some WD40 under the cap and on the distributor’s internals (and then wipe any extra WD40 off to prevent future fires). This should displace any water that is under the cap. When you get home, pull one spark plug wire at a time and make sure the terminals are not waterlogged. If there is water in the wire, it will cause corrosion and eventual failure.