NHTSA Complaint #11164071 — 2016 FORD F-150

I'VE BOUGHT MY 2016 F150 XLT FX4 SC 5.0L USED WITH ABOUT 69K MILES ON IT AND HAD IT FOR NEARLY A YEAR NOW. SINCE I PURCHASED THE TRUCK IT WILL DEVELOP A ROUGH IDLE AND WILL STALL WHILE AT A STOP LIGHT. THIS WILL HAPPEN WHEN I MAKE A MULTI STOP TRIP, FOR EXAMPLE IF I STOP AT THE MARKET ON THE WAY HOME FROM WORK, OR SOMETIMES EVEN JUST RETURNING HOME FROM WORK. SO FAR THIS ISSUE HAS ONLY HAPPENED ON CITY STREETS. OUTSIDE TEMPS ARE NO FACTORS AS THIS HAPPENS IN COLD WINTERY CONDITIONS OR HOT AND HUMID WEATHER. EVERY TIME THE TRUCK STALLS, THE CEL DOES NOT COME ON OR ANY OTHER DASH LIGHT EXCEPT THE BATTERY LIGHT AND I CAN RESTART THE TRUCK IMMEDIATELY WITH NO ISSUES. AFTER THE TRUCK RESTARTS THERE IS NO FAULT LIGHT ON THE DASH AND TRUCK ACTS LIKE NOTHING HAPPENED. I TOOK THE TRUCK TO AN INDEPENDENT REPAIR SHOP TO HAVE A DIAGNOSTIC CHECK AND THEY COULD NOT FIND ANY STORED CODES OR PENDING CODES PERTAINING TO THIS ISSUE. THE REPAIR SHOP WAS ALSO ABLE TO DUPLICATE THE ISSUE BUT ALSO NOTICED A STRONG SMELL FROM THE CATALYTIC CONVERTER. AT THE MOMENT, IT IS UNKNOWN WHAT'S CAUSING MY TRUCK TO IDLE ROUGHLY AND STALL.