i have an older 99 polaris 500 sportsman. i rode if for quite some time over the weekend and it would stall out sometimes after coming to a stop but would start right back up. later in the evening it stalled and there was a bunch of gas in the air filter box. this is not the first time it has happened i usually pull the air box plug and wait 10 minutes then it will start back up,, this time it started but ran horrible.. any suggestions ?