Here’s the update:

Spoke with the fuel injector shop. 3 injectors we’re just spraying fuel. 3 were popping “ok”. Spoke with the guy I got the car from. Cylinder 3 was apparently the issue. He told me when he cracked the injector line it didn’t make a difference to how the engine ran. Sounds like we’ve got more than an injector. Next is compression test. We’ll see what we’re working with. Maybe too much fuel could’ve bent a rod.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k