sounds like you have a choke problem, i never can get my choke to work correctly, you are supposed to adjust the choke to almost closed when the engine is closed then as it warms up it will shut off or "open up", adjustments to the choke may be necessary as the weather changes. but like i said i adjust mine and then it never opens, then when the engine is warm i slightly adjust it to where the choke will cstay open then it will never close, it sucks. but i dont know what else to do besides get a manual choke