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I have the same issue with my 2011 335i E92. Whenever I am maneuvering in tight spaces and using a lot of steering lock at slow speed, the engine surges making it difficult to control the car.
I have discussed this some time ago with my dealer and they know of the problem. It's due to the ECU increasing the idle speed to compensate for the power drain of the steering on lock, to avoid stalling the engine. They did do a software update which seemed to make an improvement it but it now I think it's just as bad.
I've just got use to it.
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