Hello together, I had an undisturbed idle and had my Magneti Marelli throttle repaired at ecu.de. Then over the summer also calm and the throttle valve was unobtrusive. Now – at the cold temperatures – the speed fluctuations occur again. Since some parts were standing anyway, now already the spark plugs, the upper motor support and the air filter have changed. As a result the “clonk” noise at the load change has gone away and my consumption decreased by around 8%. The speed fluctuations are still there. If I uncouple at about 30 km/h and roll up to a traffic light, the speed drops to 500 revolutions and the car starts to shake, but does not go out. If I already dome at e.g. 50 km/h, the speed falls usually only to the desired 700. I telephoned with an employee of ecu.de, who made a quite competent impression. This of course excluded the throttle flap and said that it was event There is only the large fresh air hose in which I could not find a hole or a crack. However, right after the throttle flap there are 4 small hoses on my engine block (see picture). Can someone tell me what they are for? Some of them are porous at the ends, so the question is whether I can exchange them myself? I also read, d ass such speed fluctuations can lie on a clogged oil trap / crankcase ventilation, but so far it does not push out oil at any visible point. My oil consumption is about. 1 l/15,000 km. Then I have read that sometimes the air quantity meter is defective, but not immediately produced an entry in the error memory. Would my symptoms fit? I am grateful for every advice!