engine stumbling at high rpm????

[Tilly819]

hi all

have a wee problem,

when i open the throttle smootly and accelerce gently in 1st gear its all ok as far as i can tell
then when i change up to second and give it some its ok till about 6000 rpm then the engine starts to stumble/ splutter... this is the same throughout the gears.

engine is a 2002 honda super blackbird on EFI

now the only thing i can think it might be that is obvious to me is that i have removed the air box and just have ITG socks over the trumpets is this lightly to be part of the problem i though iniialy it might be turbulance from the bonnet scoop but i have blocked that off and the problem is still there..

any ideas??????

tilly