I have a 99 ZR600 and have been having some problems this season. The sled starts right up and idles good, and if I keep on the gas it runs awesome. It's when I'm going slower speeds that the engine will just cut out for a sec and I loose all power like the engine dies. Then if I feather the throttle it will come back to life. I have noticed it backfire a few times as well. Anyone out there that could point me in the right direction???