I have a BX2350. It starts fine and revs up with the throttle fine. Intermittently, when I press the accelerator it almost dies. I let off and press and finally it will accelerate normally. I have only owned it for a couple of weeks. I spent about three hours tilling up an arena and it was working great. The arena was horribly dusty. I changed the air filter and still am having the same issue. Any help with the next step of troubleshooting would be greatly appreciated.