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Q: starts up and shuts off on 1999 Mercury Mystique

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it do it all the time
(1) Answer
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It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. It could have an idle control problem or a vacuum leak would be the two most probable causes. If you keep your foot on the accelerator pedal and keep the idle speed up, once the engine is warmed up does the engine then idle and run OK or does it idle rough? When was the last time the engine was tunned up?