1994 Buick Park Avenue car starts then dies immediately

hi, i went out to start my car this morning and it was running rough..so i turn my car off went to go start it again and it died immediatly...now everytime i start it,it dies out in like 2 seconds and bucks before it dies..if i try and give it gas it dies out even faster..i replaced the fuel pump a both filters like a week ago,and the car has been doing good intill now..over this past month ive replaced mass air flow sencor,o2 sencor,fuel pump and filter..what could be my problem?? thanks so much