Hello, I had the following problem with my X20XEV (Opel Omega B 1994): When it got warm, I had idle fluctuations and it went out before every traffic light. Then – as described in the instructions of berndragon – I carried out the cleaning suction system (empty controller, throttle chamber) and the oil separator installation. All work worked thanks to the instructions super- except for one- we did not get to the two screws of the crankcase ventilation tube, since we had no lifting platform n and also as layman did not know what to reduce (can) about it so much better to get to it. It was also quite dense, but we had to leave it like that now. Then we deleted the error memory. The first day the car drove super – the joy was great but not long…. From the next day the following problem: car drives the first 5min super, – then he takes for example when switching no gas back – empty running fluctuations at the traffic light 1500-2000-1500-2000 etc -beim Z turn back into a smaller gear he starts to push (use no more gas in the 2nd gear and he slowly accelerates by himself) After half an hour he then runs normal again for a few minutes. I really searched this forum for days and used the search, but somehow the solution did not always fit my problem 😉 LG Jannik