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Jerky acceleration


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I have a 2007 impreza 2.5 wrx. I've been having an issue with jerky acceleration/ no acceleration at the 4000 revs mark. Steady acceleration past 4000 revs doesn't jerk but when I put my foot down it jerks like crazy and sometimes doesn't accelerate. I have cleaned throttle body/changed maf sensor/replaced fuel pump/changed air filter and no joy. Any help would be much appreciated. Cheers 

 

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