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Sounds kinda like LSPI (low-speed pre-ignition). I only say that because of the black smoke, otherwise I wouldn't have thought of it. This happens in low rpm, but high load conditions, like 50% throttle at 2500-3000 rpms. I'd read about LSPI a bit and see if that sounds like the issue you're having.
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Instagram: rjd_f30 | Current: EBII 2013 335i 6MT RWD & Sprint Blue 2008 Audi RS4 | Retired: 2013 328i, 2000 XTerra, 2022 Civic Si |
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