Peugeot RCZ Poor Cold Start

I had similar symptoms with my RCZ, though I never properly diagnosed it myself. Rough idle on a cold start? Almost stalls sometimes? Fuel delivery issues are common. Could be worth looking at the injectors.

Indeed, this is a good description of the issue. Injector problems, I suspected that. Did you try, by any chance, fuel injector cleaner or test the injectors?

Tried the cleaner, didn't do much to be honest. I'd suggest a proper injector test, but realistically, a workshop visit is probably the best move. They can accurately diagnose and replace the defective injector.

Thank you for the advice. I took it to my local garage and it was indeed a defective injector. The repair cost 515€. Problem solved!