im goin to start over... I have 2005 hayabusa with 43k on it.... I have a small airbox mod, a pcIII with a race exaust map, running no pipes or tips, a bmc race filter, plus 2 on the back sprocket, modded the airbox sensor into ram air duck, a tre, and a speedohealer... a few months ago my hayabusa started stuttering between 2600rmp and 2900rpm. if i hold the throttle constant between these rpms lets say 28oo then the bike will slightly surge foward and backward( basicaal gaining power slightly and losing slightly; stuttering), when you pull past these rpm the bike slightly struglles to accelerate not horibly but enough to notice. Also when i shift gears up at 3k rpm the bike will jerk as if it takes a second for it to realize that the throttle has been opened.when im decelerating the bike pops a few times. ive just changed the pugs and three of them were close to black and one was white. I also synced tbs and adjusted the tps sensor to the middle (i suspect is still may be bad even though the resistance is between the correct figure but on the low side), i have also replaced with new bmc race filter and today i manualy adjusted the pcIII fuel to where the green lights are all at the top (bike showed slight improvment on accel). I ran and entire bottle of sea foam throught 2 tank fulls of gas. The stutter still persists but now more at 2800 or 2900 rpms and the bike still struggles slightly to pull past and when i shift it still jerks as if the trottle reallizes it being opened a second to late... any ideas