In a message dated 3/15/2002 7:51:08 PM Pacific Standard Time, pinkertonk@xxxxxxxxx writes: << I'm convinced it is a fuel/air thing. Either a vacuum leak or the carb. Wish I had a spare carb. Btw, its a rebuilt (store bought rebuilt) Thermoquad. >> Find another carb, an AFB or AVS, even a known good, eh working, Holly, and try it. If another carb doesn't change things, and if you have another distributor, you might want to try it, the reason I say that is because I once had an experience in which the advance mechanism was gunked up and self limited itself, the engine ran ok until one day the gunk broke loose and the advance changed. Of course the more common thing is the reverse, the gunk in the distributor petrifies and limits the advance, either way it can drive you nuts! Roy 67 Crown FDHT