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Sounds like it could be the IAC Valve. I've had them colged or completly fail on vehicles before. The dealership told me several times that there was nothing wrong with my car, or that they couldn't reproduce the problem. Have you had the dealership keep the car overnight to try and reproduce the problem when the engine is cold as well? You could also ask them about the possibility of the valve being clogged or dirty which a simple cleaning would take care of, or the motor for the IAC could be going out and need replacement also.
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