How many times did this car start up and run perfectly before you adjusted the valves?

How much experience do you have adjusting valves?

I keep coming back to the sequence of events where all the trouble started after you adjusted the valves.

Injection pump and the two 13mm nuts on the delivery valve plunger assembly: These affect the quantity of the fuel that the injection pump sends to that injector. If these have been moved, the pump is out of calibration, unless they were moved by a Bosch-trained technician on a test bench.

If you can discern the original position, try moving it back, as you've got nothing to lose at this point.

You could also perform a rough calibration using a set of graduated cylinders (lab equipment - think test tubes marked up for liquid volume measurement) that catch all the fuel from each delivery valve / injection line as you crank the engine over. Compare the volume of diesel from each position, adjust #2 to match the others.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC