I take a look at the inside of the "cigarettes" that go into the plugs.
They have a tendency to accumulate carbon and oil and then short out.

A Q-tip and lacquer thinner will clean them up nicely.- Hide quoted text -

Thanks, Orval. I checked them, and they looked fine to me when I
pulled the plugs.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"