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black smoke is an indication of a lack of air. my first thought would be to check the ebp sensor, tube and pigtail. there is a hose at the bottom of the coolant expansion tank that often rubs on or coolant drips down ont the harness and can cause the issues you speak of. could throw the number 8 contribution code as well. you can see it without taking anything apart. it's just one among many possibilities. but usually black smoke is caused by an issue with a turbo control input, like ebp or map, etc..or vgt solenoid, or the turbo itself. does it boost ok?
another thing you'd want to try is returning the tune to stock. i'd probably do that first before anything else. if that's not it, have a peek at that ebp harness right under the expansion tank. usually an injector will cause white/greyish smoke that reeks of diesel. but it is possible to be an injector issue as well. but i think those quick visual checks and returning to stock are warranted
the richest ones are not those who have the most, but those who need the least