Most common (and affordable) is fouled spark plugs, but after that, a faulty MAP sensor. They can be easily grabbed for cheap at junkyards, or you can buy one for beteween $50-100. I am not sure what the dealer charges. changing one of these is rather easy and can be done in a few minutes.
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A common problem with the 90's engines was the ECTS (electronic coolant temperature sensor) going bad. Seems when attempting to start the car, the computer in the car will only allow enough gas it thinks is needed to start. When a car is cold, the computer gives more gas initially, until the engine warms up, then gives less gas. When starting a warm engine, less gas is needed.
If the sensor goes bad, it always tells the computer that the engine is hot. The computer give less gas to a cold engine, and sometimes it will start, sometimes not. Its a pretty cheap part, and a do it yourself one, just research it a bit on line...good luck
Sounds like the idle air control valve may be clogged. It's usually in the throttle body. Just remove check and clean. That's the cheap route. the other option may be a MAP sensor if that model has one. Check with auto parts stores for the price.