1992 Ford Taurus...Idling Problem

I have a 1992 Ford Taurus that when cold shuts off in park. But once it is warmed up he shuts off and is real rough when it is at a light or stop sign. I put it in neutral and it is able to stay on but actually idles rough in neutral. I put new distributor cap, plugs, wires, and rotor already on it. Anyone have any idea what might be wrong. I need help urgently..please help if you can.

Thank you

Sounds almost identical to the symptoms my 92 Taurus had about 8 months ago. The problem turned out to be a busted vacuum hose. Dealer claimed he had to custom make a replacement and (of course) charged an arm and a leg for it. But it did the trick, no more stalling at stoplights, and rough idling was gone. I know this comes about three months after your post, but hopefully it helps?