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One of the 1965 M35 manuals listed out about 30 symptoms or behaviors and said to load the truck to max gross weight and drive for 100 miles at max speed. Then see if the problem still existed. That is probably the best advice for driving a diesel vehicle I have ever read. Glad yours is better.

95° is what the sensor on the passenger rear head for the green wire goes off of. The glow plug sensor inside the valley on the drivers head is somewhere around 160° to 170° for that system. There are actually 2 green wires at the IP. The wire to the fast idle solenoid on the drivers...

You just need a long slotted tip screwdriver to adjust the idle. The screw is under the fast idle solenoid. Shine a light in there and you should see it.

That makes sense about the advance arm to throttle shaft linkage roller needing lubrication. I drove one of my M1009’s today for the first time in a few months. I have had it for 12 years. When I first got it running it would barely idle. It would die when the fast idle turned off and...

What does lubricating the shaft on the passenger side do? I don't think I have seen that advice before is why I ask.

Sorry, but if you can make it stall while playing with the throttle. That points to an IP needing attention. I had one like that too. Very frustrating but the IP is a wear item and you have no clue when it was last replaced if ever.