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Why does my Audi A4's engine idle erratically?

I have noticed that my Audi A4's engine idle occasionally becomes erratic, with the RPMs fluctuating without any apparent reason. Is this a common issue in Audi A4s, and what could be causing it?

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This could be due to a faulty idle air control valve. It is a common issue in Audi A4s, especially in older models. I recommend getting it checked and replaced by a mechanic.

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