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Audi A4The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.
it sounds like a vacuum leak...try to spray down the engine bay with some brake clean and listen for a change in idle, if you dnt find anything that way it is possible for your dv to be leaking...