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Mine stutters a little too. I'm sure it's repairable, but my compression is low so the real repair is a powertrain swap. I see no reason to rebuild a 6.2 when better are available. Keep us posted! BDGR

Short of a compression test, you can also check the fuel delivery. Have you changed the fuel filters, bled water from the separator, bled the injectors? Smoke means something is affecting combustion, it's only a few things in the end. It is likely compression, but it could be something...