I e-mailed some friends and one well know head porter said he thought it was too rich (already discussed) and too much timing. He thought the burn was finished before it got around to the far side away from the plug. So, something else to try.
Thanks, good to know, and I would agree that it has been too rich for sure.
Its rich... with that many miles it would have a tan color
over to the intake valve to get a full burn... its way rich
EDIT
The timing is starting too late to cause all the burn over
on the exhaust side(all the burn is over there)
