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I got a 2011 king quad 400 asi thats fuel injected (throttle body) when machine is cold it runs great, after riding it for a while it gets extremely sluggish when ur just kinda cruising with a little bit of throttle applied, goin about 8-10mph with just a little bit of throttle it feels and sounds like the engine is struggling or under an extreme load, if u give it more throttle it will pick up and take off and run great, it seams to me i got fuel/air problem but know nothing of how to work on fi atv, i changed and used all grades of gas, changed plugs ( which r black as coal) , if u take aircleaner out it will run better for a little bit then it seems to get worse, it will also backfire when freewheeling or coasting down a hill whether its 1mph or 10mph short of taking it to the garage and raping my wallet i dont know where to go or what i can do do solve the issue if anything, i dont wanna have to spend $300 on a fuel programmer for a machine that should run fine without one, oh forgot to mention the kg is completely stock and only has 660 miles and 140 hrs, can anyone help???