Hyundai I20 Crdi 2012 Jumps bad at sometimes has power loss

Hello together The I20 CRDI 1.4l Built. 2012 my daughter starts bad after longer service life. Man has to be quite long orgling until he arrives. Has he run shortly before he starts normal. I have already changed the fuelilter, did not bring anything. I set up before the start with the hand pump pressure, no difference at the start. Sometimes he has a short power loss during the ride for 2-3 seconds afterwards he catches himself again and runs normally. Running power is 170,000 km Does anyone have an idea or is there already a contribution to the topic ?