Bang in the air filter box!

Hello to my problem: It’s an Audi C4 Limo with AAR engine that has 240 000 km down. To my problem: I start the engine (cold) super turns but immediately after the start to 2500 rpm falls back then but to 950-1000, immediately start off is no topic however after 200-300 it takes bad gas and if I then stop and want to start again I first have to turn up to 2500 and slowly release the clutch and then I have a misignition in the air filter box. After another 500-700 meters the whole thing is over. If I start it warm (not operating temperature) and want to start off again I also want to start a misrecovery in the air filter box. And I always have a slight training wheel shake and sometimes swing swings, sometimes I have a training run around the 650 rpm then again 750 or 950 rpm. What I’ve already renewed temperature sensor 2 pole (orig. VW) Lamdasonde from Bosch Klopfsensor was able to give an oil hose nozzle and a new gas hose nozzle.