Posted for Gary Casey <casey.gary@yahoo.com>:

Fred,
 Okay, but.... you tried changing plugs early on and said it didn't fix it.
 And then after you removed the (presumed) short AND changed #1 plug(again) it
was cured.  I hope so, but I'll act like some of our more frustrating
customers(Ford or Knorr), "now I want you to recreate the problem to
demonstrate you really fixed it"  You should say that once with a German and
once with a Detroit accent to get the full effect.  Obviously, you can't put
the intermittent short back in (you start to see how a customer like that can
get frustrating), but you could put the bad plug back in and then to confirm
it again, put it in another cylinder.  To make it exactly the same use a
cylinder that is fired by the same polarity spark.  Or even check the plug in
a plug tester.
 Gary