I recently bought this 250K mile car and I swear an old 240D is quicker. Acceleration is very slow but once up to speed it cruises fine on the highway. It idles smooth, starts easy and doesn’t smoke even at full throttle. One thing I noticed was an absence of that turbo whoosh that these car have. It has a new air and fuel filter and I disconnected and plugged the EGR line. It doesn’t have a trap oxidizer. Also, the transmission is reluctant to upshift unless I momentarily lift off the throttle and then it shifts firmly (although not as harsh since I fixed some broken vacuum lines). Where do I start the diagnosis? I had the same car a few years ago and it ran like stink so I know how well they should go.