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HI ALL CAN ANYONE HELP ME IVE GOT A 94 CLASSIC AND ITS HOLDING BACK A BIT ON THE BOOST, WHEN YOU PUT YOU FOOT DOWN ITS HOLDING BOOST AT ABOUT 0.6 BAR THEN WHEN THE REVS GET TO ABOUT 4000RPM THE BOOST BIULDS UP TO 0.9 BAR HAS ANYONE GOT ANY IDEAS WHY ITS DOING THIS?