Worrying symptoms in 2015 Toyota GT86: black smoke and increased fuel consumption

Hey guys, I'm pretty worried about my 2015 Toyota GT86 at the moment. I've now got 178,683 km on the car and it's showing some really worrying signs. When accelerating, black smoke comes out of the exhaust, the check engine light comes on, the engine just stalls, feels weaker and runs rough. It jerks when accelerating, the fuel consumption is pretty bad and it stalls when idling, not to mention the jerking when idling. I suspect a defect in the mass air flow sensor. Had problems with my mechanic last time, so I wanted to ask here first. Have any of you had similar experiences and can give me a tip on what to do now?

(Translated from German)

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