It's possible. These car's are not like carburated cars where if there is more air entering the engine the idle is going to speed up. There is a desired Idle speed set in the PCM. And that is where the idle stays under certain conditions. If there is a vacume leak usually all that will happen is that you will throw a lean condition code and/or have 16.4 fuel trims.
I'd try cleaning your TB and IAC passages.And depending on what the temp is outside or when you are seeing the increased idle (like first startup in the morning) it could be normal.
