if the car runs like crap then you could try replacing it. see if it is faulty by unplugging it. the car should run crappier when you do this. when you plug it back in it should be happy again. you really don't need to touch the MAF unless it gets really fouled by some oil, but even then it has a heated element which will burn off the oil. get a book to your car here, only certain years: http://www.germanautoparts.com/Books/BMW. if you want to clean it out it may help but the MAFs last forever unless they've been through a hurricane or drowned in some water.
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