Yep, a bad float will cause flooding, as will the needle seat. Won't hurt to overhaul the carb, drain and clean the tank, new spark plug, change oil, check fuel filter, install a fuel shut-off valve, check fuel line for deterioration inside it. Check condition of air filter, if so equipped, although most snow blowers do not have an air filter---no dust in winter! Don't put it off--time passes swiftly, winter comes along fast, and you'll put it off, until the first snow! Uh-OH.

Don't you have an idle air screw that you can adjust?