It may be the coil pack when they go bad they get hot and stop firing when they cool off it will crank again until it gets hot again.
It may be the CRANK SENSOR ,i had a car one time,it started fine,and drove fine one day i drove it about15 miles,stopped ,got back in it, started it, drove about 5 miles ,and cuts of with a little hesitation,it cranks but does not run, i sit there for about 20 minutes,crank it, it starts back ,i drive it back another 15 miles ,and runs great ** the crank sensor gives the signal to the ECM if the ECM ,never get that signal ,it does n't know to crank the car,or what cylinder to start with,check with your saturn ealer ,and get a second opinon
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