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  1. RPMs drop and jerking while accelerating

    Engine & Drivetrain
    hello everyone,i have GMC acadia 2008 and it has 200,00 kilometers . it drops RPMS from 2500 to 1500 at the speed of 40 to 50 miles/hour while accelerating... starting and initial running has no problem, but after reaching ( i guess 5 and 6th gear ) if i take the foot off the Accelerator pedal...
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