2000 Saturn SL1 Q&A

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

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 -
Answer 1
seek diag on this as someone needs to see car to give an opinion -
Answer 2
What does it do when in park? normal idle , but then fluctuates when stepping on brake pedal? If so have brake booster checked. -