Swapping components from known good cylinders to known bad cylinders can be a diagnostic step that makes sense. If the misfires follow a particular part swap then you have your answer. Swap a plug, swap a coil to start to see if the misfire follows. Injectors are more difficult in this sense so i'd out rule the plugs and coils to start.
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2020 X3M /// MHD Tune
Prior Bimmers
2017 240XI Hybrid / FBO / MHD E40
2015 235XI FBO / MHD E30
2009 335XI FBO / COBB / E30
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