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  1. zj accelarates down hill

    Drivetrain Tech Center
    I have a 1997 zj 5.2 184,000 miles. Did a full tune up, and on a road trip from idaho to washington the jeep started accelerating down hill. If cruising and the transmission is shifted in to neutral, the engine revs up to 2,000 rpms and holds. I replaced tps (throttle position sensor) sensor...