Oh you are right I didn't do plug wires! Duh.... I need to look into that.

The voltage at the ICV is good. I have the shop manual and that checked out according to speck. I checked the vacuum lines allover by means of WD40. Maybe that's not thin enough to get through the cracks.

I also tried isolating a single cylinder by removing ignition leads, but that didn't change anything. I then tried cracking the fuel lines while it was running, that didn't really change anything either.

I suppose I'll re-check the crossover tubes and the injector seals.

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1984 300SD, 384K miles. Gold/brown.