Update. I finally had some opportunities to work on the car.

I was amazed to find that, after charging the battery, she started up with a few cranks. She even held an idle for a short while ... then died again and wouldn't start.

The next day, I was able to start it up again, this time feeding it Diesel Purge out of a bottle. Again, it eventually lost idle, stumbled and shut down and wouldn't crank again.

Again, however, she fired off the next day, which is when I finished the Purge and took it for a spin up the road and back. She felt sluggish (but that could have been my imagination after driving my other - more powerful - vehicle for the past few months). It died when I got back.

The next day, it started right up again, held an idle, revved up and and seemed to run fine. I let it die on purpose. This time, it fired back up. It still won't hold an idle.

To make a long story short, it's now running on the fuel that was in the tank, a blend of diesel and WVO, and seems to be starting OK and running OK but will not (yet) hold an idle. Power when driving seems to be lacking but is definitely driveable power. I have not adjusted valves or tested compression, thinking that both are fine for now.

Given this information, is it still the opinion of the wise that the IP itself is at fault? Should I check/adjust timing first? Could there be some sort of building vacuum that is shutting things down at idle?

CRSMP5 - is the IP you mentioned still available? If so, let me know cost.

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1983 300SD, Silver/Blue, 230+K (rebuilt at 196K)