I have a different carburetor than I ran last year in the Grand Enduros. Another driver/car used this same carburetor and had no problems. The car idles smooth as can be, and can be slowly brought to high RPM. When the throttle is mashed, the carburetor stumbles, and breaks up, but regains itself a little while after.
This is the same problem I had with the carburetor from last year, which was a computer controlled carburetor. I had removed the computer, and ran it as a mechanical carburetor.
The only vacuum line I have attached is for the power boost. This is a pre-computer Rochester Quadrajet, and there is no choke on this carburetor. I am guessing that it has something to do with a vacuum advance on the distributor??? I don't have any vacuum line on the distributor where the vacuum port is. I'm out of guesses.
Any ideas out there of what could be happening.