X20XEV idle/start

Hello no. It’s to cry Last Saturday I drove menem Calibra about 150 km (to the manta meeting, I know I don’t have a manta but Calibra and Manta are so to speak) He ran without problems, climate on full power. No idle saws nothing. Like a new car. Also stood in the traffic jam, so stop and go. I arrive at my house, stop in front of the garage to open the gate. He just goes out! I start, runs again quite normal. Today Friday, I pick him up again out, jumps normal at only has every time you have to stop empty running problems. He then blows off to 500 u/min and then regulates to normal. And just after the start he is immediately released again. Idle mode is suber! What do you think? I am grateful for every answer Greeting