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i have a stock rb20det except for exhaust, hks, and blitz sus intake. i am running a high flow cat even. it studders/bucks at low rpm BEFORE boost, feels fine when its boosting. i just put a silvia non turbo bumper on and the intercooler isnt getting air until i cut the whole when i buy a blade for my jigsaw but i am not beating on it. i have my spark plug cover off and one bolt holding the ignition and ground wire to the block. the block is grounded at the intake and turbo side. any ideas? changeing spark plugs help? runs rich at low rpm, does anyone have a normal a/f metering chart/dyno graph i could look at? it dynoed 200hp to the wheels two months ago all stock max boost 8.3 pounds and went down to 7 over high rpm thanks shawn

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https://www.sau.com.au/forums/topic/176002-rb20-issuesstock-motor-help/
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