I need help with my GTP
 

Okay, My car died on me while i was driving down the road. Had no clue what was wrong with it so my uncle picked it up on the car trailer and he said it was the fuel pump so he changed that then it ran for a while then died again. He changed some kind of relay thing and now the car will start just fine but then just shut off after a few seconds. He has no clue what is wrong now. Any suggestions?