Hello! I have to tell you a strange story: Last night my Buick made problems. He stuttered, then he went out and didn’t want to.. Then pushed him about 20 meters far to the next parking lot where he then sprang up again. However, he had hardly any performance, he stuttered and the service lamp lit.. This morning when I wanted to drive into the garage everything was again like before. Service lamp was gone, he stutters no more and also has normal performance again.. Can anyone explain that to me?!? Greetings