bashman18

My C300 Benz rpms fluctuate on acceleration and it is well noticeable on the speedometer. the needle goes up and down on trying to switch gears. I have serviced gear box oil and engine oil yet it is still doing that like that. I also replaced my catalytic converter since the former was blocked and yet same issue persists. no fault code seen when scanned on system. This fault starts from gear 3 selection and persists on 4,5,6 upwards. What can I do please? any advise

see video below for the fluctuating rpms