[SmiLer89]

Hi everyone, I have a problem with my n52b30 e90 auto. Started long time ago but is getting worse. The car is 132k , the main problem is when I'm driving let say about 10-20 miles and press the gas pedal the revs goes down for 2 sec and then accelerate.
Also when car idles if I revving the engine sometimes don't go more than 1000 rpm is just rpm go up and down , but that's not always I got videos when is ok when is not .
I've been reading a lot on the forums could be many things. By the way , valve cover gasket , vanos ,big disa , ccv ,eccentric shaft sensor all genuine part been changed 20k miles ago , apart from that the car idles perfect , and power is great apart from from intermittent power loss at low speed, no fault codes at all.
Any help 🙏 is appreciated.