Thanx for the diagnosis, and I'm glad to hear you think it sounds ok.
Just out of curiosity, what causes the color change. Is it just deposits being burnt
on or off of the ceramic. If so, is the white ash-like residue, or what ? Brown and
wet looking, I could understand. My plug was anything but wet, nice and dry and
clean. I would love to see a spark plug come out of any car I have ever owned
looking that clean.