Bad air oil separator (aka PCV valve) causes check engine light and code(s). (It's been a while and going off memory)...

 

Thanks for your reply! However I don't have CEL or fault codes... Didn't prompt anything except the rev needle telling me its not feeling well...

 

Oh, my problem appeared some time after having removed the intake manifold. It was severe enough to stall and required a tow. The HP fuel rail has a pressure sensor attached to it. I had not fully inserted the connection (which I found after getting a PIWIS 3 clone read the code and tell me that the sensor was most likely the cause). Opened it up, pushed the connector firmly, heard a click, and after the required (J/K) facepalm to the head, all fluctuation went away. (I eventually replaced the HPF pump unnecessarily)...

 

From watching the two clips I can't tell that there is anything wrong. Yes sorry if I wasn't clear I do not think you have a PCV valve issue, (unless you pull a code indicative of it). Maybe clarify what issue you are having. (Ours would stall, and I guess it eventually shook itself more and more loose that the stalling got worse)...

 

It's just going up and down even during ACC