Twingo Engine Misfires and Jerking

I own a Twingo and had similar symptoms recently: rough running, check engine light, the whole shebang. It turned out to be a faulty fuel injector. Have you checked the throttle response? A bad injector can really mess that up.

I haven't specifically evaluated the throttle response, but I'll add it to my list. Were your symptoms identical, particularly the jerking and power loss? Did the check engine light come on?

Yes, the symptoms were almost exactly the same. The jerking was especially noticeable at lower speeds, and the check engine light was definitely on. I’d advise getting it checked out by a professional mechanic. It's tough to diagnose these things definitively without the right tools.

I appreciate the advice. I'll schedule an appointment with a reputable workshop to diagnose the issue. It was indeed a defective fuel injector, and the repair cost 515€.