Idling okay, but starting from 1200-1500 rpm he loses ignition

All vacuum hoses are new and correctly laid, the ignition without vacuum at 8 degrees, on the carburettor I have already adjusted the mixture in every direction. The idleness sounds also somewhat and I have on the cylinders between 10,3 and 11 bar. Distribution fingers, cap, ignition cable and candles are new. If I give gas, then it comes with a short clean, then it starts to spit slowly and with an estimated 120 0-1500 rpm (I unfortunately only have a contactless tachometer) it sounds as if it only ignites one half of the distributor. Any idea? I’m already trying to buy a completely new distributor right away… Thanks and Greetings Chris