i have a 20 hp v twin cylinder that is giving me issues. I consider myself pretty good with mower engines but I am lost now. it runs good on half chock but stays at high idle and doesn't slow back down. it has a little miss here in there. if I take it off chock it will idle good but at high idle it hunts bad almost to a point of dying. what I have done so far, rebuilt carb, all new fuel lines and a new fuel pump and gas tank. new plugs and set valves. there is no air mixture screw on the carb, that would be what I would adjust now if it had one. can anyone steer me towards something I have missed?
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