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Very fast idle when in park-when in gear vehicle goes 30-40 MPH on its own on 1994 Oldsmobile Cutlass Supreme

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
engine revs up to around 2500 rpm in park. service engine soon light is always on.
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