Car starts but will not engage (automatic). engine sounds rough. Exhaust poor em on 2012 Audi A4

Intermittent problem generally first thing in the morning. Engine is running rough and car shakes all over. Engine appears to be flooded. Black smoke and strong smell of unburnt fuel out of exhaust emmission. Switch engine off and restart seems t clear the problem. Could it be faulty ejectors/ignition coil or faulty Catalytical converter

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