After 2 years, I have finally started driving my 65 FB. Engine is a 302 HO from an 84 Mustang GT. I seem to have developed a stutter or stumble at just off idle speeds. Whenever I let off the accelerator for a second or two, to coast, or to shift, ( 4-speed), the car sort of stumbles for just a second, then is fine. On hard acceleration, the car bucks for a second, then goes like hell thru all four gears. All electricals are new, and I have a new Edelbrock 1404 (500 CFM) carb. It is a manual choke, and I have the choke plate firmly fixed. Idle is rich, but I cant seem to lean it out very much, but plugs look good. The car runs very well. just bucks a little on light acceleration, and when I let off the gas for a few seconds. Any suggestions ?? I know that these performer carbs are easily tuned with metering rods etc. but I dont know where to start.