My girls did the same thing, try covering the air intake up, about half of it should be good to start.We used tape just to see if that was the problem.That fixed hers w/ no problem. Itll take some tweaking to find out how big to leave the hole but should solve your problem. If that is your problem you can figure out a more permanent solution than tape like restricting your air box w/ a plastic plug you can drill out. ~Matt