OK, just looking to see if anyone has had this problem before or knows what might be the cause. The bike is an 07 F4, if I am on the throttle and accelerating it is fine, if I am off the throttle and decelerating it is fine, but as soon as I try to maintain a steady speed it sounds like it starts to cough or blow back into the air box from the engine. When it does this there is also a moment of hesitation in the speed of the bike. I had the ECU flashed recently hoping that would fix it but to no avail. Any thoughts, advice or information would be greatly appreciated. Thank you in advance.