my machine has started to idle rough when starting. sled has 15,000 kms on it with the original spark plugs. I hope changing the plugs will solve the problem. did the exhaust donut check with wet rags, sled dies within three seconds, donuts have been changed once already. anything else that needs to be checked. read a post about a filter on the fuel pump that may have to be cleaned. any positive feedback welcome. sled seems to run fine after running it down the trails a couple kms. no power loss and does not stall when on the trail.