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Message: <blockquote data-quote="absidian" data-source="post: 195426" data-attributes="member: 4356">Yep, gotta love our BMWs despite the pain they give us sometimes.I flagged up the spark plugs because when the distributor koyak, the plugs can be badly fouled by the contents of the mixture that never burnt off in the cylinder...plus they're already old to start with. Really easy to remove and check them if, like you say, the HT leads are powering ok.I think there is a method to check for definite if your AFM is working... something about a multimeter to check the min/max resistance across the AFM terminals.The other thing might be failed ICV or stepper motor, as once the car starts it can't maintain an idle state. This can be removed/cleaned before ultimately replacing it.With all due respect, it would probably be wise to get a second opinion from another mechanic before spending more money in case he's pulling a fast one on ya. ---</blockquote>