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There could be many reasons for this. If your A/C is on, or if your defroster is using the A/C, the PCM could be revving the engine slightly to keep the additional drag from stalling the engine. It's also possible you have a vacuum leak, such as from a disconnected vacuum hose, under the hood. Or a problem with the EGR system. Is the check engine light in your car on?

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Q: When stopped at a light why does car rev up and then back to normal?
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