Citroen C3 Engine Stalling

I had a similar problem with my C3. Rough running, stalling, the whole shebang. For me, it was the coil pack. Have you checked the cable or plug connection for the coils?

Coil pack? Where is that located, and how can I check it?

The coil pack sits on top of the engine, usually connected directly to the spark plugs. Honestly, if you're not super familiar with engines, it's probably best to take it to a workshop. A defective cable or plug connection of the component is a likely cause and they can diagnose it properly and check if it is really that. I spent hours troubleshooting mine before realizing I should have just gone to a mechanic.

Thanks for the advice! I took it to the workshop, and you were spot on – it was a defective ignition coil, just like you said. Cost me 95€ to get it fixed. Runs like a charm now!