Problems with running the engine

Hello guys. I have problems with my Volvo over and over again lately. And I have sometimes (it rarely occurs, so 2-3 times on 100km) very short rucklers/slips. Sometimes I had the impression that it is dependent on speed, but then I always failed to reproduce it. But I know similar symptoms of nem VW Fox, since it always occurred at the same speed and a new camshaft sensor created remedy. In the gas operation (Landi Renzo LPG plant) nothing was noticeable yet in the petrol operation. Was then with the V70 in a car gas specialist workshop where you have cheerfully replaced parts. New evaporators, new injectors, new spark plugs. Didn’t help anything. I then changed Lambdasonde before Kat, ignition coils and again spark plugs (now Volvo original according to advice in a Facebook group). With the whole new race he ran then for approx. 100km real cream, also on car gas. But then the Rucklers came back :/ A week ago it appeared for the first time that I also noticed Ruckler in petrol operation. Then I noticed that the engine starts cold perfectly, warm but very unwillingly, only after a few seconds. So can it have something to do with the temperature management? Had once received a mistake regarding the coolant temperature sensor and then replaced it with the thermostat (in June). Yesterday came however the glei Is there something wrong with the wiring? For tips and ideas I would be very grateful! Best regards Sascha