This could be why your Turbo isn't providing any power. http://www.dieselgiant.com/mercedesaldaboostsystemservi.htm
The lack of kickdown (downshifting) could be from a bad kick down switch, which is located under the accelerator pedal. It could also be from other componets, but I don't know enough about your specific transmission.
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1976 BMW 2002- 100k
1995 BMW 325i 175k
1984 Mercedes Benz 300D Turbo Diesel- 270,000 mi
1981 Mercedes Benz 240D- Estimated 300,000+ mi Returned to the earth
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