[Rick Parker]

After checking for air leaks at the mounting base and assuming the carbs are all syncronized and drawing the same amount of air. Be certain the float level is correct in that carb. Totally investigate the idle circuit. Remove the carb, empty the fuel, remove the idle mixture screw and jets. Check for foreign material at the bottom of the idle jet bore and all passages leading to the idle discharge hole in the Throttle Bore and in all fuel jets. View through the jets while looking at a light source to be sure they are open, look at the air correctors too. Blow compressed air gently through all passages. Reassemble and give it a try.