Need purchase help 85 300d 332k

[winmutt]

I found a 85 300d on craigslist for cheap.Of course there is nothing worse than a cheap mercedes.However here is what I know about the car. The current owner has replaced the turbo (frozen when purchased), the oil lines and there turn fuellines.The problem?The car has no off the line torque.Once its underway the car seemed to have no problems going(turbo spunup etc)but I had to keep it floored the whole time.I cant hear any specific nailing.Today I did a purge (leftover fluid was clear), and serviced the alda. A mild improvement in torque. I also cracked the fuel lines and did not notice any particular difference in sound between any of the cylinders. I also did a Italian tune up and the car seems to be behaving better. I did a tea kettle test and it was about what I expected for a car with that many miles. There was little to no oil smoke how ever a good amount of oil smoke came from between the IP and engine block. Under load there was a small amount of black smoke. At idle the car is indistinguishable from my car and it revs just fine manually pulling on the throttle and when it was in L or R the car seemed to behave about normal.There is definetely a vacuum leak in the system.Brakes have little power, car does not shut off on its own, etc etc. So my question is, what else can be the problem?