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Originally Posted by n00b0rKa
Update: I've replaced my MAF sensor as I finally got a MAF code. The code went away, low-end power improved somewhat. The rev hang has changed somewhat, and now it seems even more software-controlled than before, the revs clearly stopping for a moment on 4k, then 3k, then dropping back again. So after all, this might even be an intended feature to maintain oil pressure while the engine is cold and being revved? At least this is my only guess now.
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I have the same issue with ridiculous rev hang on cold start along with the rough idle. Did you ever end up solving this? Similar to yours, my car runs amazing when its warm and warm starts are perfect which confuse me.