I have a 1987 Pontiac Grand Am that refuses to start once it has been driven...

...enough to get the motor warmed up? I have put a new Fuel pump relay, tried a new fuel pump, tried a new throttle body , it only has the one injector, nothing has helped. If you turn key enough to start fuel pump , 3 xs , not enough to get spark, it sometimes will start.Runs great once started, just cannot rely on it starting once it has been driven, even after sitting for awhile. Any help will be appreciated.
 
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