Going into what your saying, you have owned the car a while and its never done this before, so its a new problem. Rare chance its timing, and small chance its the fuel pump either. Is it loosing coolant?
As Steve Cooper said, check for air leaks or a blocked fuel filter first, specially if it does this under load or the turbo spooling up time, remember there is a little brass filter in the inlet T of the injection pump also. I installed all new proper stainless hose clamps and new rubber fuel lines when I purchased mine, as taking the standard clamps on and off the standard hard/brittle hoses will cause air leaks after age. And remember just because there isnt a diesel leak, doesnt mean air cannot be sucked inside...
Shaun...
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