Starts but Stalles

My 1993 Buick Skylark 2.3 L quad OHC 4 cylinder,IDI system ,would not start after stopping and turning the car off for about 10 minutes,had to have it towed home.We replaced the ECM(electrcal control module),MAP(manifold absolute pressure senser,Ignition Module,Crankshaft Sensor,Coolant Temperture Sensor,Fuel Filter,checked for leaks in the hoses and for any broken wires, Now it will start but stalles(dies)after its been running for awhile are going down the road.Well got the car to stay started for 2 days that was after we changed the spark plug boots out,But now its doing the same thing again, Will run for about 10 minutes and stalls out . Any suggestions?
As of today December 9,2005 the car will run for a few days and then it will die (while driving down the road in traffic). Have replaced the ignition switch out and it still does the same,Some times you have to turn the key switch a couple of times before it turns over and some times it just starts.If any one can think of anything else that it might be let me know. Comments are welcomed.

Same thing just happened to my 1992 Buick Skylark and it turned out to be the ignition switch was bad.