Cobalt EVAP System Failure

Indeed, a faulty activated charcoal filter can certainly manifest in that manner. Has the purge valve been assessed to verify its operational integrity? A malfunctioning purge valve, either stuck open or closed, could potentially mimic the symptoms indicative of a charcoal canister failure. Furthermore, might I inquire whether you've observed any degradation in fuel efficiency preceding this issue?

I have not yet isolated and tested the purge valve, but I will add that to my list. As for fuel efficiency, it does seem to be modestly reduced, perhaps on the order of 5% - 8% lower than previously observed. Might this fuel efficiency reduction more definitively point to an issue with the charcoal filter itself?

Considering the concomitant reduction in fuel efficiency alongside the stalling and EVAP code, the charcoal filter is increasingly suspect as the root cause. Given the complexity and potential for exacerbating the emission control system's performance, I would now recommend consulting a qualified technician for a comprehensive diagnostic evaluation and subsequent repair.

Thank you for the informed assessment; I appreciate the advice. Following your recommendation, I had the system professionally diagnosed and you were correct. The activated charcoal filter was indeed defective and was replaced. The check engine light is now off, the engine no longer stalls, and the fuel efficiency has returned to normal. Total repair cost was 275€.