[Grand Prix SD]

i have a 2000 grand prix gt that died on me and wouldn't restart. i replaced the fuel pump since the sender was bad and it ran for 10 minutes then stalled. it would restart and run, but only if i hold down the gas pedal to keep it idling. finally it would just start chugging and not restart. so i replaced the regulator and the same thing happens. the check engine light is not on. it seems like it is getting too much gas. i don't want to get it towed to a dealer. does this sound like a vaccum leak?