The engine wont turn over when it is hot out side

I have a 95 chevy cavalier itry to start when it is hot out side and their is nothing but all the lights come on the dash. i can start it no problam in the mornig and when it is hot i can jump the starter with a screw drive but that doesn't work all the time. i have an ingector that leaks on the number 4 cylinder but i don't think that would cause the car not to turn over. i have replaced the cylinoid, and checked the battary and altinator.