Thanks for the fast responses! I know the indie is going to be doing a comp check, but I've been led to believe that this test can be somewhat vague for a diesel engine, although I would assume a finding of "no compression" would be quite clear!

Obviously this test and its verified result will dictate the course of action. With reference to my gasoline engine experience, what doesn't make sense to me is why the engine would start so well, only taking on its problems after a brief period of running. Perhaps a crack in the head opens after warming? I shouldn't think a valve would do this, or perhaps a cylinder might? And the periods where it slips back into running well. Confusing.

At any rate, I'll post on the progress, and always welcome everyones input!

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Chief

1991 350SD