Are your spark plugs tight? The middle plug on the rear bank has backed off twice on mine. Just retorqued it, problem solved for me anyway.
Mike

I have a dream, and that is a 69 Boss 302 with Jules Asner in it.
Current - 2002 Chevy Silverado
Former - 98 SVT E0 T-Red 4/4/97 #173 of 6535(so long girl, you'll be missed)