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It could be any number of things. The MAP sensor is bad, a severe vacuum leak, the fuel filter is plugged, it needs a tune-up like new plugs & wires etc., the fuel pump is weak or leaking if its a manual one. If the car runs rough at idle have a vacuum test done also, while the car is running at night, open the hood and see if the plug wires are arcing as you will see what looks like small lightning sparks around the wires. The worst case scenario is the piston rings are shot causing poor compression. A repair manual is usually available at the local auto parts store, or shopping center like Wal-Mart and Meijer. I wish you the best of luck.
It could be a combination of 2 things. A faulty MAP sensor itself or a bad TPS (throttle position sensor). It's not uncommon for a bad TPS to idle when the motor is cold but once warm, not idle fast enough to keep the vehicle running.
Check the idle air control valve. This sounds like it is not working right. it controls how much air the engine gets when it is idling. the pcm tells it to open more or close. they get old and dont respond fast enuf.