tempoffroad

I have started to have a problem that when i park my car at work or home for up to 8 hrs when i go to start it, it will crank and then die and has gotten worse today i had to give it some gas to stay running after i let it try to hold the idle on its on. It was doing it every few days now it is getting worse. after i get it running in about 15 sec it will stay running i was thinking iac but didnt know. I tried to search. It is an 01 gt stock Thanks