i have a new xr7 super z with a 60 in cut and the 28 efi. the problem is that on any kind of load im loosing all my rpms. even on the most minor inclines my rpms come down the the point that i have to throttle back all the way to get it to go again. my dealer doesnt know why and the mower is only 2 weeks old. what do i do now with a $12,000 mower that can barley turn itself around on any kind of unlevel surface.