AUC runs restless and has less pressure than an air pump

Hello guys, my engine capacity monster ( AUC ) is running like on 3.5 pötten, as soon as you tap on minimal gas it runs quietly. When driving , yes it’s already an air pump, it feels like it has somehow max. 20hp (welcomely appreciated ). But from the sound, couldvman think that there are 2.0 16V in it (volume moderate) candles, cables and LuFi are new. Timing belts according to previous owners are not yet old. The PCV valve (you can blow through from both sides so) seems free to be. Errors are not in the memory. (From I read out with VCDS) Has an idea (only meaningful statements please) or comes from the vicinity of 44577 Castrop-Rauxel and could look at it? Compression I once wanted to measure, only could not find a measuring device.