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  1. Acadia running really rough and 2 codes.

    Engine & Drivetrain
    So, I had my check engine light come on after my Acadia started idling really hard and came up with a "Reduced Engine Power" notice on the dash. Checked the light with the OBDII and it gave me P0089 and P0087. Any ideas on what could cause both codes to get thrown at the same time? I have never...
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