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If you mean the engine is revving higher than normal or fluctuating a little it is probably due to the electronic control system compensating for an unusual condition. In colder conditions, the controller will increase the idle speed to warm the engine more quickly and to compensate for colder, thicker oil both in the engine and the transmission. When the engine warms up, the idle will return to normal. You may also notice fluctuations when devices in your car turn off and on. For example, in warmer weather if the vehicle is left to idle for a while or soon after you get off the highway you may notice the idle surge as the electric cooling fan on the radiator kicks in to cool the engine coolent. If you are idling at a stop and you turn on the lights or the defroster fans, you may notice the idle dip and surge as the system compensates for the extra load put on the alternator. There are also times when your engine may be trying to compensate for an error condition like a bad emission sensor or a vacum leak. If you ever notice that behavior and your check engine light comes on you should take it in for service.
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yours face
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