Mercedes Actros Mp4 2015 has no power till gear 8

[Uwihoreye Grace]

hello mates!
i need help on my mercedes truck mp4. it loosing power on the 8th gear. it is not accelerating to 40km per hour
i tried to remove DPF and adblue off but still no power
kindly share with me your ideas of what i can do

 

[00slk]

Possibly a blockage in the fuel system. You will really need to have this scanned with the proper Mercedes Benz Truck scanner otherwise you will be just guessing and throwing money after money trying to guess the problem