sounds like fuel cut then! personaly i wouldn't touch a FCD, it just covers the problem! might as well sort it! sounds like your getting boost creep, very common in GT's espesh if you've put on a induction kit/de-cat/full system, basicly it's where your lil CT9 turbo(?) is making more boost then the little wastegate can expell, making your boost creep up to fuel-cut. have a search on TGTT.com, your best bet is to get the wastegate on your CT9 bored out to expell the boost faster so it dosn't creep up to fuel cut, one of ivans fancy downpipes would also help! also if you have a chat to simon