Newly acquired 2005 Prairie 360 won't stay running without the choke on, it will run with the choke off just won't idle. I haven't tried to play with the carb because it's an hour away at my shop. When I got it I did pull the carb and clean it, but that's it. My question is what would cause this? Do I need to play with the settings, if so what?? Maybe an air leak causing it to run lean?