prob with a 2000 Pontiac fire-bird?

[NormanM]

i have a 2000 Pontiac fire-bird i was going down the road and it would not shift out of 2 gear its an auto then i stopped at a store for gas when i left it wouldn't shift out of first so i pulled over and the car just shut off and i could get it to start up aging but it turned over what could be the prob