2020 M240i with DAW 2.5+, DS2 HPFP, all the usual FBO mods, and PCV delete on custom 93 & e50 MHD tune from CD919. I got the car about 5 months ago with all the mods done, solid service history, and a very caring previous owner who had all work done professionally. I reached out to previous owner and he said he replaced plugs & coils within last 10k, and this actually happened to him a few times on E50 map since tuning. He believed it was LPFP crashing, since HPFP is upgraded. Injectors are still OEM original to my understanding. I had it on the 93 map up until a few weeks ago to get used to the power; am on my second tank of e50 now when I had this issue. There is a possibility the mix wasn’t perfect - I used my friends flex fuel sensor reading of 72% to do my math - but I still targeted E50 so it shouldn't be far off. One other thing - I have been seeing an intermittent shadow code [21A026 - Combustion engine: abnormal ignition key start/stop function detected]. I replaced the fuel tank breather valve about 2 weeks ago to remedy some weird start up hiccuping that was present on the 93 tune & this one, but the code still returned once after. This and an 2x wastegate calibration code are the only issues I had on the 93 map, nothing to this degree. What happened: I did two consecutive pulls within about 2 miles of one another, first one went super smooth 40-100; second went smooth & then quickly resulted in a bunch of misfiring & rough running. Car made gurgling noises as indicated in the video. Shut off and parked to do a visual inspection & some forum digging, determined it’s probably plugs, coils, or faulty injectors - so cleared codes & restarted and drove very carefully home. No issues at startup, idle, or while driving - no codes returned. DME codes before clearing: 120408 - Charging pressure control: Switch-off as consequential reaction. 140001 - Combustion misfires, several cylinders: Fuel injection is switched off. 140010 - Combustion misfires, several cylinders: detected. 140401 - Combustion misfire, cylinder 4: Fuel injection is switched off. 140410 - Combustion misfire, cylinder 4: detected. 140501 - Combustion misfire, cylinder 5: Fuel injection is switched off. 140510 - Combustion misfire, cylinder 5: detected. I am thinking this is some combination of injectors, LPFP, LPFP sensor, E blend, issues with E50 map, or plugs again - please let me know your thoughts.