Hello scotty and everyone
i have a problem with my opel astra 2003 2.0 DTI 100HP Diesel
if i run to 160Km per hour the car being loosing the power and i can not accelerate more , it just loose the speed
to fix this i have to turn engine off and start it again , everytime i have to turn engine off when i am running with car and start it again starting from 70 km/h

Same problem for me also

i think i have found the problem , maybe is the MAF mass air flow metter , it needs to ble cleaned or replaced , and if it is a diesel engine the egr valve it need to be checked to clean or replace with a new ,

pray cleaning or a new maf works, that's a cheap fix for a german car