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Q: when at stop light or full stop the engine revs up with brake pedal depressed on 2000 Saturn SL1

the harder i put the brake pedal down the more it revs up; then it will just return to normal --- doesnt happen all the time at periodic times
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What does it do when in park? normal idle , but then fluctuates when stepping on brake pedal? If so have brake booster checked.
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