Quote:
Originally posted by WydRyd
OK, thanks guys.
Latest update is, I've turned off the Boost Controller and caned the living ***** out of the car (checked for undercover detectives this time) and whoala, problem disappears at 0.5-0.6bar of boost. I think I have a fuel pressure issue, or a damn vacuum leak at higher boost pressures.
A faulty/dodgey speed sensor would cause problems at any speed as it's not really load dependant, so that rules out the speed & reference sensor.
Now I have to air & fuel pressure test the whole damn system 
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try closing up the spark plug gapp alittle to see if the stumble goes away, you can be misfireing from the boost blowing out the spark causing the misfire, ive seen it quite a few times..