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Your car is getting to the age where the plastic parts in the air intake path are starting to crack from age. I replaced the boot that attaches to the throttle body on an '04 the other day because it was starting to crack. These parts are not expensive, even from the dealer, compared to most BMW parts.
You have to dismantle the air intake path to examine these parts. You may want to clean the throttle body and idle air control valve while you have it apart.
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