Unround motor run

Hello to everyone, I bought myself a Twingo 2003er, 58hp as a winter car 2 weeks ago. During the test drive he ran great, now I realize that he runs in idle and during the drive a bit unround and slightly stutters/huttles. Motor does not go out and it does not light up the engine control light. I have read here already more often about the ignition distributors and ignition cables, can this be because or do you think of anything else? Thank you in advance Greeting ZR786