A2 (1.4 petrol) does not start in warm condition!

For two/three weeks, our second car (1.4/75hp/petrol/Bj2000/85000km) has the following problem: As long as the engine is cold, the car starts without problems…. As soon as it is warm (about 8km to the KiGa) the following picture is presented: Ignition on – key on start – starter turns – no error messages – BUT the car doesn’t start… it also “hears” everything “normal” … only the engine doesn’t start. The game repeats endless times until the engine starts – at the beginning only with about 600 tours and rises after a few seconds up to 1500/min to have the foot on the accelerator pedal (including the “blue” cloud from the exhaust)! After another moment the speed normalizes and you can drive with the A2 without any problems… According to our workshop there is nothing to be found in the fault memory and a superficial control of the relevant components also did not succeed. Before we now issue an order component for component in turn We hope to have built and tested here on the decisive tip… Thank you in advance! Greetings from the “P3C family”