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Question: 1999 Chevy Malibu dies just before reaching operating temperature.

I am having a problem with my car dieing just before it reaches operating temperature. It starts better on cold days. Once I drive it the almost exactly the same distance from my house it will die. Just before reaching operating temp. On warmer days the problem is worse. The tack starts bouncing and it chugs out. Some times it just dies with no tack bounce. Once started again it runs fine the rest of the day this only happens after it sits all night and I try to start it the next morning. I have replaced these parts on it. Idle air control valve replaced twice, EVAP canister, purge valve solenoid, fuel pump ( a year old), battery (a year old), water pump, vent valve solenoid, fuel tank pressure sensor replaced twice, brake line on front, AC compressor, tension pully also recently flushed and refilled radiator, recent oil change. New plugs, wires, distributers. I have had several mechanics try to fix this and no shop has been able to. They just keep having me replace part after part and it is getting costly. Your assistance would be appreciated greatly. After I replaced the idle air control valve the last time the check engine light went out and it seemed to be running fine and it would start better to not turning over so many times but the plug on the valve came undone so I plugged it back in and this problem started all over again, the engine light came back on and it has not been able to be fixed again.