[Terry,OH]

17 is not as good as you think. Try adjusting the two brass idle adjustment mixture screws slowly, one at a time, to get in as close to 20 or higher at idle with the engine warmed up. Do adjustments with vacuum gauge attached look for the smoothest idle and steady vacuum. This will not fix your problem with high speed. It is an idle adjustment. At high speed the carburetor uses different internal passages than the idle.