Any info on my 2010 YZ 450 would be helpful. At low throttle or in the wood is even worse. My bike starts acting like its gonna stall and starts back firing and popping. I've already put a new fuel pump in it. Change all my mapping back to stock. Checked all my connection. Also check with my tunner and didn't find any codes. It's already been to the bike shop twice. I'm gonna try and clean to fuel injector next???