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using a digital volt ohm meter test the throttle position sensor. if it has a dead spot at idle position it will stall. also if the throttle plate is dirty it can cause a stall at idle and all you have to do is clean it.
When idling for long periods of time the spark plugs can get fouled, Soon as you step on the gas the engine will usually spit and sputter then go or just stall. Avoid prolonged idling, if you must do it periodically give it some gas (pump the pedal a few times) to clear the plugs and keep them from fouling.
Most low idle speed problems on these engines are due to a faulty idle air control valve but since you state the idle will go up and return to idle then i would say it is working properly i think you have a throttle body coking problem ( dirt and grit accumulates around the butterfly valve in the throttlebody ) to fix this simply remove the fresh air hose from the throttlebody and open the throttle all the way up use a clen rag and wipe clean you may use a solvent such as B12 on the rag but dont use too much
If it's fuel-injected, you may need to have the injectors cleaned, and also, any air filters should be changed at the same time along with gas filter/s. If it's carbureted, the same as above, but have someone clean the carburetor completely. Make sure all air hoses are attached correctly, securely and NOT broken. If broken, replace them.
The IAC; idle air control valve, controls idle speed. This may be gummed up or faulty. But first check for vaccum leaks. These can occur at hoses, fittings, oil cap, dip stick, gaskets. buy a can of spray carb cleaner and clean the butterfly valve and bore, IAC, and use the rest of the can to search for vacuum leaks; run the engine and give short squirts of carb cleaner to the items listed above. The engine idle speed will change when you spray on a leak.
Sounds like a fuel filter is clogged or a very weak fuel pump. Filter can be picked up at local auto parts store. Located underneath the car on the inside of the driver side frame rail usually.
HI disconect battery cable and recconect start engine let it idle for 10 minuts do not touch gas peddle let it relearn idle strategy if this doesent help try cleaning throttle plate by using carb cleaner or the special cleaner whit engine of open throttle spray cleaner using a tooth brush scrub throttle plate till clean
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