First - adjust your linkages per the Factory Service Manual article. As part of this procedure you need to re-set your bowden cable - its a white nut on top of the valve cover that tells the trans when to shift. Yours is off somehow.
Second - I second the banjo bolt cleaning suggestion.
Also, verify the the turbo boost line is connected.
On my 85 when I bought it, owner said the car had no power. Found a broken boost line...reconnected...power was back 
dd
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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
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