Problem with Sportster 1200 C

Hello HD friends, I did a tour last week. At Tempo 120 the performance suddenly went back at short notice, as if no fuel came into the engine. Shortly afterwards it repeated itself and there were misfires on running band. Quite loud, as if they wanted to shoot me. – Then the engine went off. I had to turn off the Sporty. After about 1.5 hours I left it again and nothing happened. Until it was back to temperature. That started again from the front. The new Manifold gaskets and a new air-flilter turned on me. The whole for limp 220 tacks.. In the hope that everything was ok, I wanted to meet yesterday to Frankfurt for the biker. After I had driven 50 km on the Atobahn, the performance suddenly subsided again, and there were again misfires, which became stronger and stronger until the engine went out again. – I now feel pretty fucked up. I paid for what didn’t have to be and the problem is imme Does anyone have any idea what to do or does anyone know the problem??