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I have been dealing with the same issue of lunging at steady speeds. My 08 335 is completely stock with no tunes. I have replaced the coils and plugs and just completed a walnut blast of the intake valves. Ran great for about 20 minutes after the walnut blast and now is back to lunging. So far I am not getting any codes to show up. Any ideas would be greatly appreciated. I am new to the BMW family.
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