Twingo, however, only comes out in the middle of the temperature in the stationary gas

Hello municipality, am now new here and ask a question immediately. My girlfriend drives a 2001 Twingo 16V, engine: D4F-702 he has the following problem he simply goes out in the stand gas (without notice) but only if he is in the middle range of the temperature i.e.: if he is cold he runs without problems and if he has operating temperature then also only in the middle of these temperatures he only goes out in the stand gas. Have changed air filters and ignition coil. Possibly one of you has a Lösu ng. LG Daniel(Daniel was already forgiven so I’m in the forum Danier)