Hey, just eant to start of my saying i have 0 experience in fixing cars, but i realy want to try fix this problem myself as i think it could be fun and i could learn a lot (and ofcourse save some money). So the problem is when i drive fast and give full throtle while in 4 or 5th gear (sometimes even third) the cars service lamp lights on for 2 seconds and i suddely loose some power. After that i will have trouble driving fast uphil and it feels like the car has etered some sort of emergasy mode. Told my friend who knows a little bit about cars and he told me it could be some airfilter or diesel filter that is clogged or broken. Can anyone point me in the right direvtion of what to do or what part i need to change?

Opel combo 2010

Thanks :)