this might seem silly but have you checked the boot between the intercooler and turbo? when that sucker comes off you dont get boost at all and you will have a VERY sluggish car. It's happened to me... they should have a clamp on it but it's just a friction fitting. this would be the bottom right side of the car.
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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed
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