carlegacy

ok i have a legacy turbo and originally experienced fuel cut however due to help from this site thats solved with an mbc.however i still can't get to full boost without problems it feels like a missfire when it happens is at heavy throttle or .5-.7bar like i say it isnt fuel cut i had this before and its nowhere near as bad but might aswell be cos i still cant unleash the cars potential.when it happens i have noticed the revs dont alter according to the clocks but the boost gauge shows the boost flickering from just over 1 bar back to wherever it was usually .5 bar.
have some coils on the way and plugs anything else i should be doing.
thanks