Missing

Hello everybody! Two weeks ago I helped my son buy his first vehicle (2000 B3000) at an car aution. I have replaced the serpentine belt, anti brake/spedometer senor, and spark plugs. The problem it has now, is there seems to be a miss (studder) during acceleration and during general driving. I think it's an electrical miss. Any help?

Did you replace the spark plug wires too? Start the truck at night in a dark garage and look for a sparking light show. If you see a light show, arcing on plug wires, change them.