This is probably something simple, but I am striking out. I couldn't start the 5 hp tecumpseh snow-king engine and believe that it was due to some very stale gas. I drained the tank and lines, replaced the sparkplug, removed the carburator and opened the float bowl and sprayed gumout in every orifice of the carb until it ran out from some other orifice. After reassembly the thing runs, but only with the choke on full...even after fully warming up. If I open the choke at all the engine stalls. Any ideas would be appreciated. Thanks.