Have you checked your throttle linkage for possible binding? Also it may be due to the carbs not being in sync. Back off the idle speed screws & remove the linkage from the right carb. Increase the idle speed screw of the left carb to get the engine idling around 700-800rpm & use a syncrometer to balance the two carbs. You may have to adjust the linkage of the right carb to match the left. If it is idling at 2000rpm your idle speed screws are way too high or the dist plate may be sticking. Just a few thoughts.
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