I have never in all my years of maintaining engines had a spark plug
that just plain quit. But it just happened.

Running fine - then suddenly rough. Started that tests. First looked at
the distributor - near new. Next tested the lead by running the engine
and putting a strobe on it. totally dead. Pulled the plug, check the
electrodes - near new. Put the plug back in. Got another known good lead
and installed it. Checked with the strobe - stone cold dead!! Only thing
left = dead plug. Replaced with new - fired right up running smooth. I
have had distributor caps go dead on one plug, I've had many leads go
bad or dead - but never a spark plug - not like this - stone cold dead.

Like the Lil' Boy sez _"Larn sump'in new every day!"

John