I have to take my vacume guage home from work tonight. It just dawned on me that I have the vacume advance hooked up to the port on the side of the metering block. I know it has advance, but I forgot that the holley has a port just above the throtle plate as well. I never checked which port to use with a vacume guage.. Maybe that is my problem.(No I an not talking about manifod vacume either.) It has been about 10 years since I played with a holley, so maybe it is as simple as that I have the advanced hooked to the wrong port.