2011 sportsman 500 trouble

[ontariosportsman]

First things first, hello all. I hoping i can get some usefull information from you guys on here. I bought a 2011 sportsman 500 in the summer, i have had nothing but problems with this thing. I bought it used from a dealership it had 300kms on it. Its been at the shop 3 times now for the same thing, it won't stay running. It runs for about 15min then just runs like sh*t. It dies as soon as I let off the gas and it spits and spudders, clunks and clangs. Its the biggest p.o.s. I have spent my money on, i try to use it for hunting and i put a plow on it to do the driveway but i can't trust the thing. Any ideas on what this might be as the mechanics at the dealership obviously can't figure it out and its really frusterating. Thanks in advanced guys.

[Xploder]

Sounds like the engine is geting too much fuel, or could be a spark issue, need more details on how you get it to run good again?

[ontariosportsman]

I'm not sure what they try to do to fix it at the shop to make it run part-time. I just got it back and cleaned the driveway out and it worked fine, i parked it in my garage and went to get it out last night to move some snow and it ran for about 15min. I put some fuel stabelizer in it last night and started it and just kept the throattle on for a few min to get it mixed. then i went out today to see if it worked but it ran for about 15min again then died.