Q: 2.0L diesel sluggish acceleration

I would suggest checking the MAF sensor for starters, but also check timing to be sure it set properly. This can affect the fuel economy and the acceleration for sure. When the timing is not correct, the combustion cycle will not be correct and the air/fuel mixture will not be burnt effectively resulting in a loss of power and fuel economy. You should have your car’s loss of power symptoms diagnosed firsthand by a certified technician, like one from YourMechanic. They will be able to pinpoint the issue and help you fix it accordingly.