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Thanks for the input! My other M1123 runs like butter, but this one is definitely only running on 7 cylinders. There are a couple other HMMWV's in the area and they all run a little differently, so I get what you say about their personality!

Thank goodness I have a 200 amp alternator. I'm a pretty good wrench but I'm a little intimidated by diesels. I also only have 1 arm, but I have helpful neighbors and roommates! I think I'll roll up my sleeve and give it a shot! Thanks for the input!

Thanks! Hopefully that will narrow it down. I have another M1123 that runs like butter. Every diesel guy that's listened to this one said that something is wrong.

I just acquired my 2nd M1123, and after cleaning up the fuel system and starting the engine for the first time I'm hearing a rattling or clunking sound coming from one of the heads. I'm a competent mechanic but I've never worked on a diesel before. I'm thinking about just hauling it to a shop...