I need help with my 96 Buick Roadmaster my first time working on a car

From what I understand from your post You HAVE replaced all these parts and the car will still not stay running? 1) go back and check to make sure you hooked everything back up correctly. (very easy to miss something if you did all that work) 2) if it's starting then dies try checking fuel pressure. (check and replace fuel filter located on driver side frame rail under back door) Hope this helps a little bit.