[leaseline1]

Ok, I see you have a choke on the carb but cant tell if its a pull choke or electric choke from the picture. If its electrical, I recently had a virtually identical issue appear after servicing my carb and it ended up being a little detent between the electric choke mechanism and the main body hanging up near idle. Also was causing some richness as the choke was slightly hanging closed. If its a manual choke, then still check the choke to be sure it works freely. Personally, I cant stand Holley chokes with performance cars. Curious what the outcome is and good luck!