You did not say if the problem went away after your car was compeltly warmed up or not.
Since the problem was posted before you might already have tried the suggestion. Hook up your fuel inlet hose to a container of regular diesel fuel and drive it around and see if the problem changes; better or worse. If the problem goes away you have some problem from the fuel tank up to where your removed the fuel inlet hose or possibly with your fuel.
An air leak in your fuel system could cause some of the problems.

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84 300D, 82 Volvo 244Gl Diesel