wondered if anyone can assist with a running issue i have, my 2005 superduke is having a bit of a bad day running wise,

if running around at light throttle around 4/5k ish it has a stumble and will hunt, ( almost like its dropping onto 1 cylinder)if i open the throttle it will clear perfectly, it just started doing it a day or so ago,

i will give a little spec on what's been done to it previously and checks relating to this fault

has a remap from John at track electrics around 2 years ago and normally runs perfect, with acros fitted and the o2 sensors removed

the throttle sync has been checked and there is no tps issues or fault codes, all the sensors on tuneecu read perfect

air injection is removed and blanked,

the fuel filter in the tank and around 2 thou miles old,
ive just checked the valve clearances incase they are tight and they are perfect,
plugs done around 2 thou miles and have a perfect colour/jheat range
the big grey connector is dry and perfectly clean

the only thing i can think of is if i have a bad batch of fuel, i have just topped up with £8 of super unleaded but its not run for very long since, or the injectors need to be cleaned/tested, i quite often run bg 44k fuel cleaner through it thou,

im a master tech on cars so i know what im looking at, but this one is baffling me,