Thread: N52 Low Idle?
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      12-02-2012, 10:56 PM   #5
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I would check the vanos solenoids. See this DIY for more info:

He is physically replacing the solenoid but all you need to do it pull them out, clean them with some MAF cleaner and then hit them with some compressed air. I would switch the exhaust and the intake also to help extend the life of them. They commonly get clogged which can give you the symptoms you see above.
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