Right, took it to my tuner and before we put it on rolling road it was runnning rich.
Managed to get it to 0.9 by turning co2 screw 5 turns clockwise, so as lean as it could go, but on the rolling road it was 0.5 and the fumes where very potent so my tuner said it needs mapping properly, so we abandoned the test until he can map the chip correctly.
Took him for a spin init and it was fine at low revs and high revs when the turbo was boosting fully just hesitant mid range.
We both agreed that it was chucking in too much fuel too early before the turbo had chance to kick in.
On the drive home it was fine on the motorway as i kept the revs low and at low boost but once off the motorway, and driving about 50 mph, it started running rough throughout the rev range and struggled to build up boost but after a few miles it cleared itself?
Im thinking that it choked the plugs up due to the rich running?