i was blowing snow and no problems then i lost the pto belt. i replace belt and try starting it up, the engine was cold so i pulled the choke, all it would do is backfire. i got it started and started to blow snow it seemed run smooth untill i started in to heaver snow, then it would bog down and die. i replace the plugs, fuel and air filters and ajusted the belt tension. it seems like it's running rich. i'am at a lost. i've called a few dealers and and all they tell me is to bring it in. if it not engine itself, i'am capable of fixing myself. any help would be apreciate.