Thank you all for your very quick replies and good input!

The hose for cylinder one is extremely greasy, the one for cyl 2 a little bit. So, I need to replace at least one of them and then I suppose it is best to replace all of them. At least I have to get it all off and check. Even though there is no visual damage, I cannot see any other explanation than a leaking rubber hose for the greasy hose/pipe.

When cold the car runs perfectly, then when it gets hot there is zero idle capability. I had a similar (not that bad) problem back in 2003. A Magneti Marelli specialist in Milan compensated for it by adjusting the throttle position sensor, but I kept on having problems until I late 2007 discovered that one of the gaskets for the EGR pipe flange connection was missing. Amazing. I had checked everything and had it in 4 workshops and no one could identify the reason for the idel problem. The gasket must have been lost when I had it in for a cam belt change. However I believe that one of the intake runner hoses had started to leak by then since I kept having idle problems and fuel smell.

So, when I finally brought out the car 1:st of May this year after many years in the garage, the hot idle problem was extreme and when I slowly tried to rev the engine more and more when the engine was warmed up throughly, the turbo whining was absurd, it sounded like a jet fighter before take off. So, at 5500 rpm it "took off" with a giant blue cloud behind the car

Now the turbo has to be fixed as well, but at least it lead my clearly to the root cause.