Hi Guys, need some advice. We're all aware of the sputtering below 4k RPM on 848 evo when cranking the throttle but my 2012 model sputter at higher RPM as well. I can crank the throttle at 7k RPM an will still sputter (but not stall). This at any gear. If I dont crank the throttle then no issue. Any idea what it could be? I've changed the spark plugs and fuel filter & tried injector cleaner no luck. Anything else It could be?