Sudden detonators – from where at once???

Hi! I just had a big problem. Yesterday I drove from Hesse to Bremen. On a distance of approx. 200 km always nice with 170-190 km/h (more do not give the winter tires). The car ran wonderfully. When I arrived here and wanted to drive again after 2 hours the car jerked without end, because of ignition oscillations. How can this come at once? Before was absolutely nothing. 2 hours later everything was broken. Today is also a holiday. The candles have only been gone since 15,000 km. With a maintenance interval of 100,000 km, they can’t be broken yet, can they?????????? After the fast drive I moved the car at 120 km/h due to speed limitation in front of the Bremer Kreuz. Then 5 minutes of city traffic and then shut off. So the engine was not turned off hot, if someone looks at this as a cause of error. The control lights are all off, from there I can also say nothing. What should I do now? Tomorrow morning I have to go to Dortmund and In the meantime I have already bought the car. Maaaaaaaaaaaaan….