[Maroon 5.0 LX]

I think it certainly could be from moisture. What happens when you wash your engine down somwtimes? Your wires get wet, and water collects in the distributor cap. The engine runs like crap If this pump blew coolant all over the place it could have gotten into the ignition, especially if the fluid was hot and steamy at the time.

Anti-freeze will not evaporate like water, and will leave a film of anti-freeze, which in turn could cause the problem. Pull the cap and check for moisture inside, and moisture in the plug wire insulators at both ends.