it maybe just a timing problem
There are several things that can cause your Jeep to stall while idling. The timing may be off or your fuel filter may be clogged.
2001 sienna stall while just stop while driving. electric just cut out power, then switch can operated but idling roughling
It could stall if you use the rear brake while going downhill. Is this the case?
get an engine diagnostic check, a lot of different problems can contribute to your situation.
sensor or belt
sensor or belt
O2 sensor, if you have replaced it already, pull it out and make sure it hasn't burned it again. Jeeps can be notorious with these O2 sensors.
The most likely cause of a 1992 Ford Aerostar stalling while idling is bad spark plugs. The plugs should be changed and the timing checked to resolve the problem.
If the car is starving for fuel or air (low power at idle), the car will stall while turning.
If the car dies while idling, the timing might be off. Other causes can include a clogged fuel filter or a bad spark plug.
Oil in the distributor.
prob a vacume leak