1996 Chevy Lumina Sputters and dies.

I've been having trouble keeping my car running lately. When I start it, it tends to sputter for a few seconds, then die. When it stays running, I have to sit and wait for a few minutes before I can drive away, or it will die. I was told to replace the mass airflow sensor, which I did, but it did not help. I don't know if it's coincidence or not, but it seems to run worse on days like today when it's a little nicer outside (around 50 degrees). Help me please :)