My friend's 2000 GMC 350 V8, 85,000 miles, won't start after heavy rain. This morning there was no spark at the plugs. Plugs, wires, cap and rotor were replaced 8,000 miles ago. We finally got it started today by warming the cap and coil with a hair dryer. I can find no corrosion on the connectors or plug wire terminals. Anyone have experience like this? Suggestions would be appreciated.