Black smoke and shutdown problems on my Opel Combo

Check the air filter first to ensure it's not clogged, as this can cause black smoke and affect engine performance. If the filter is dirty, replace it and see if the problem persists. Let me know how it goes or if you have any other questions!

filter is clean and new

(Translated from Spanish)

Inspect the fuel injectors for any signs of clogging or malfunction, as they can cause black smoke and engine shutdown if not working properly. Consider using a fuel injector cleaner to see if it improves the situation. Let me know if this helps or if you have further questions!