knighthart67

I have a 89 mustang with a 91 thunderbird 5.0 in it, still fuel injected... the car runs good from a cold crank, timing is set at 12 dead center. but after runnung the car for a little while and i cut it off it will not start back unless i roll start it????? it will crank but it just won't start, kicker is new starter, new battery and selinoid. Can anyone offer any ideas or suggestion.
Thanks
need help, I am confussed????????