Should have mentioned that the cold starts are rough like its missing a few cylinders. Will measure the resistance. I've got a Bosch injector test stand so I'll check for drippage, cracking pressure, and the spray pattern. I want a baseline before running WVO. It will be good to have extra injectors, and I may like to rebuild some sometime as I do have the testor. Like the idea of bringing it up to normal temps before trying to pull the GP's. If it cools down can the engine be run without the intake to warm it back up before the compression test? Wish me luck, I need to work on the W123 wagon first, and oh ya Xmas is coming.....
Thanks so much for all the ideas.

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Currently driving a very clean 1985 300SD from the West Coast.