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As previously mentioned, cleaning the intake valves and ports (via walnut blasting) can have a tremendous effect in performance. I just did this for my '09 335 and was absolutely floored by how much junk was in there. Honestly, I'm amazed the car ran as well as it did. Hesitation and stuttering were my biggest symptoms, no codes were present.
While you're in there, replace the OFH and t-stat gaskets, and the two oil cooler o-rings. You do NOT want the serpentine belt to fail from oil contamination!
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