I have a 2005 outlander max xt. My brother in law was riding it up north this weekend and when he returned to cabin he says "your 4 wheeler is broke." What I found is above 15 mph it is running sluggish like its starving for fuel or air. I checked and cleaned air filter, also installed new plug. Neither of these helped. Any suggestions? Has this happened to anyone else. When it is in neutral it sounds strong when i give it gas but when I put it in gear( high , low or reverse and give it gas it is rough.