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Message: <blockquote data-quote="wiramod11" data-source="post: 598204" data-attributes="member: 6781">If the rpm is not stable it may consists of few problem that cause it. My assumption is your ride is 318i M43? Than you might want to check out your AFM and there is another part near the throttle side (black color) can't remember what is it call - might be leaking air... try ask the mech to plug in the GT1 comp to check for error code ... plus did the rpm not stable and the car is shacking? (if yes than it might be due to your engine mounting - if not than get it check).Mine few years back issue is due to AFM (which i diy clean it myself), than that black cover near the throttle is leaking - change it, afterwards i change the O2 sensor as well... just to make sure the car breathing is better...</blockquote>