The original Quadrajet for my 67 400 was in the trunk when i bought the car about four years ago in pretty rough shape. I've sent it off to two different quadrajet resto specialists (Quadrajet Pwr & Carolina Carb Specialists) and still encountering same problem that i'm looking for solution to. The carb is stumbling on the primary side upon initial acceleration. It hesitates upon normal acceleration and takes a second or two to 'catch-up'. Trying to determine if any one has experienced this issue and knows of a recommended fix..or if this a known issue these early gen quadrajets.