Car drives fine but when I slow down to stop it ideals weird and dies?

Car drives fine but when I slow down to stop it ideals weird and dies?
Added (1). It is a 1999 Ford Escort. About 117,000 miles. Check Engine light is on and just came on due to this problem.

Car drives great, transmission shifts smoothly but every time I come to a stop the car will idle erratically and die most of the time. If I put it in neutral and hold the peddle at 500 RPM the car does not die. Any help would be appreciated since I do a lot of work on cars by myself. I'm thinking MAP sensor or O2 sensor maybe.

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