I bought a used 2015 sportsman EXT to plow snow. It starts easy and idles when cold. Runs good until I plow snow. After the 1st pass when I let off the throttle it stalls and will not start or idle unless I give it gas, as soon as I let off the gas it stalls again. If I let it sit for 5 min. it will start and idle like it should. Any help would be appreciated.