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Thanks for the update! It seems like I had the same issue as the OP - the (brand new) SP526 plug was bad. The center electrode came out of it and it was arcing to the head. That apparently caused the COP to fail as mine was also starting to melt. Two new plugs and a new COP and I'm back in...

This is an old thread but thought I'd check to see if this fixed your problem for good. I've got a 13 6.2 super duty with 85k and I'm having the exact same issue you did. Found this thread by accident when trying to search for similar issues and yours was the only one I came across. I heard...