2002 Ford F-250 Engine Stall After Dealer Warranty Work on C

Engine Mechanical problem
2002 Ford F250 Two Wheel Drive Automatic 116000 miles

I have the 7.3 engine. I received a recall notice from the dealer concerning a faulty cam sensor. Took it in an had it replaced. That night on the way home my truck stalled in the middle of traffic. The RPM went straight to 0, the engine light and water droplet lights came on and the check engine light came on. Tried to crank and it took several attempts. Plenty of fire from the batteries but it acted like a timing issue. The truck did not run rough at all like bad fuel or being out of time. It just stopped. Did I get a bad part? The dealer says it is not their fault and to keep driving it to see if it happens again. No issue before recall work was done. I a a single female that can't afford to be stranded in a bad part of town. Help!