Hello, my Audi 100 has an undisturbed idle. If it was cold he didn’t have it and turned at good speed but I found it is cold, because it’s exactly when I gave gas with the pedal once afterwards he doesn’t spin very deep and unround I would turn on the car and just let it run it purring like a cat what can it be? It’s a 1.8 liter engine [DR] Bj 1983 Dear Greetings Marc