2000 alero dies while driving plz help

I have had my 2000 alero for a few years now and it has been a very dependable car to me until now.. for some reason my car just dies while I am driving. But only when driving I can start it and let it run.in my driveway all day and nite if I wanted to but as soon as I get a few miles from home it just dies every time I drive it I have replaced the fuel filter but no change so I changed the fuel pump Car still dies!!any suggestions on how to fix this problem? Next im changing the ignition ijust dnt have a clue what it could be. Someone help:mad:

Stop the guesswork, when it dies do you have spark when it wont restart,what engine do you have?