engine trouble

What is your question?

im not sure whats going on with my truck. it has died on me twice in the last month keep having more and more stuff fixed but still havent found the problem. on some occations it will start right up and run perfect for about 15 mins then it falls on its face when u hit the gas and sometimes it does it as soon as u start it. yesterday it was getting worse and just died. anyone got any ideas?