The 1997-2003 Grand Prix with an alarm system ( I don't know if they ALL have an alarm system or not...) have a Passkey III immobilizer-type setup that cuts power to the fuel pump and starter. This is EXACTLY what happens when it stalls out; the car will just suddenly die, with no warning at all except a shudder, and the "low oil pressure" and ...
Our list of 37 known complaints reported by owners can help you fix your 2003 Pontiac Grand Prix. Problem with your 2003 Pontiac Grand Prix? 2003 Pontiac Grand Prix Problems and Complaints - 37 Issues
2003 grand prix stalls
Posts: 1. the car starts fine, it runs for 5 secionds and then stalls, cranks rite back up and does the same thing. i disconnected the battery cable for 30 minutes then reconnected them and it runs fine again. it does this about every 10 starts.
The 2003 Pontiac Grand Am has 3 problems reported for engine hesitates when accelerating. Average failure mileage is 221,600 miles.