S60 2.4 Start problems

Hello, I Dominik and new here…. I own an S60 Built.:99 133tkm 2.4 140hp. Is not the first in my family… my grandfather had a Volvo representative for 35 years…but once we are not anymore…. So now to my problem, my beloved elk jumps in the morning when it is cold, so from about 7°C not on all 5 cylinders, after a short wobble in or also mla nem gas shock runs the whole… the topic I had last winter, however, if I had V-power or other n “Edelsprit” in the tank had, I did not have the problem. Now this year it can happen, after the first start and then stop at the first traffic light the engine goes off. My consideration was, throttle valve, because it always falls at the traffic light at 500rpm and then goes up also 900rpm. Spark plugs could still be, air mass meters however also… unfortunately I am a little helpless and don’t want to change everything and then it was the last vll had j a someone here already the problem or knows what it might be… unfortunately I haven’t found the right answer in other threads here in the forum yet… I am very grateful for your help. PS: Pictures I still submit to