No start after it warms up

I have a 1989 pontiac firebird, 5.0 liter, tune port injection, after car warms up and then you shut it off it wont restart, if you let it sit over night it will restart just fine but will only run until it warms up, have replace the ingition module and pick-up coil, when it wont start it cranks fine has spark and fuel pressure

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