My st stutters at high revs(5k plus) it is not affected by the amount of fuel in the tank. So far I've changed the coil pack and it's exactly the same. Ht leads are fairly new so I can't see it being that.

So basically have we got any ideas? I'll try the fuel pump change soon as ive got a spare. But if that doesn't affect it what else could it be

I've heard the crank sensor can be related does this sound right?