2001 Chevrolet Tracker

Engine Mechanical problem
2001 Chevy Tracker 6 cyl Four Wheel Drive Automatic 64000 miles

I drive for about 20 minutes turn off the car, if I start it back up immediatly it'll start again, if left for a couple of minutes it wont start again for 20 minutes. (Since the problem started I haven't driven longer than 20 minutes) After running for 20 minutes if left to idle it dies.
Please Help
March 4, 2009.

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