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In Comfort and in Drive and with Off/On disabled, my M240 usually idles fine at red lights, but occasionally I get rhythmic surging. The tach bounces from 700 to 1200 and back, and I have to keep my foot firmly on the brake because the car wants to go play. Any insights? MoneyPenny
 

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In Comfort and in Drive and with Off/On disabled, my M240 usually idles fine at red lights, but occasionally I get rhythmic surging. The tach bounces from 700 to 1200 and back, and I have to keep my foot firmly on the brake because the car wants to go play. Any insights? MoneyPenny
I'd suggest you check the ICV (idle control valve) before anything else.
 
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