Hi all. I have a Gen 1 Fazer 1000 2003 which I picked up in April as a do up. ( light cosmetic damage ) I have added a Ivan's full monty kit, akrapovic end can, modified the air box, pipercross filter,modified the manifold rubbers and balanced the carbs. On top of that I serviced the exup and the tps was fault checked ok. I have fitted new plugs and coils because it was firing on three cylinders which appears to have worked. However....the bike stutters and coughs around 2.5 to 3k when coming on the throttle or within that rev range and runs rough upto around 4k where it starts to clear and then takes off like an r1! If you nail the throttle from a start through to the red line then the stutter doesn't appear. It only appears in that rev area when you open the throttle. Today it was so bad as I rode through a village that the bike stalled and struggled to start again. The bike has 14k miles and appears looked after. Any suggestions?