ds5 2.0 hdi almost die

[Picklerick]

Hello, (citroen ds5 2012 2.0 hdi manual) lately i have problems that car wants to die in first few minutes, but only once. The rews go very low, it almost dies and than goes back up. It usualy does this while i am still, in about a minute. But today it did it few minutes later when i was driving around 40km/h, and it felt like i hit a wall for a second. Almost died on me while driving. It only does that when cold start, after sitting for about 12 hours