Starting Problem

My '85 Bronco II V6 4WD is having problems starting. When I turn the ignition the car turns over and starts. I give it gas and the engine revs as it should however when the ignition returns to the nuetral position the car dies instaed of going into idle. However if i rev it and give it alot of gas for a few momoents as the ignition goes to its idle setting the car seems to run okay. It won't stall while driving or at stop signs. On very few occassions it has shut doen while in idle.

Any suggesstions? I think it is one of the fuel pumps?