1982 300SD

problem: 150 miles into a trip my girlfriend noticed a strange vibration/noise. When she realized it was the car and not another nearby vehicle she pulled off into a rest stop. The car died on her as she pulled into the parking spot and would not reastart right away. The coolant temp was norm as were the other gauges in the vehicle. When she opened the hood there was smoke that she described as comming from underneath the aircleaner.

I went and picked it up. Started right up on the first try, but makes a terrible knocking sound and idles erraticly. I also noticed black smoke comming from the exhaust and there is almost no power when trying to get her to move.

What I have done:
I parked her and pulled the aircleaner and intake ducting. the turbo shaft turns easily and does not seem to have any ecxessive play. I also pulled the valve cover and everything looks neat and in order. That's all I have done so far. Any ideas????

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1987 MB 190E 2.3 16V- Name Pending
1982 MB 300SD -Old Blue
1965 Ford Mustang - Laura