I was wondering if anyone could point me in the right direction. My 2005 250xs planes fine and runs at medium RPM fine but as soon as I get on it it seems that it will run so-so for a short distance but around a 1/4 mile or so it starts sputtering a bit like it is running out of gas. If I come off the throttle to about 3500-4500 it levels back out and runs fine. As soon as I get on it again it does the same thing and hestitates and surges hestitates and surges and so on. Any suggestions? Thanks