OK, I will definitely have to test them before I can tell for sure if they are my problem.

Another question, what did your glow plugs look like when you removed them?

Mine are practically spotless. One did have a tiny bit of "scale" on it in a few places but even it was practically shiny when cold.

My rough running problem continues even after the car is warmed up.

My injectors for sure need to be replaced but I need to make sure if/how many of my GP's need to be replaced.

I will say that after I tightened up those fancy nuts on three GP's my startups are very smooth and quicker than before.

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1993 W124 300D
-297K on the clock as I type this.