helpmy car does not start

[james87gt]

Iv bin have a problem with me car starting when its hot so i changed the starter it work fine for two weeks but yesterday day i took it for a 15 mile run on the high way to go to my girlfriends house i let the car sit for like three hours go to start it and it doesn't start it rotates but will not fire up so i check to see if its getting fuel i was 45 psi so i check for spark it looked a little weak so i was thinking that might be so i try a new coil but no luck so now im really pissed because i need to get home so i call some friends so i can try to pop the clutch we want down the street i tried two times it did nothing so we tun it around and come back i tried it again but this time i held my foot on the gas at the same time and it fired up. I drove it home it ran ok but felt like it had a lose of power but i have bin having that problem too but this was a little worse but any way i get it home and go to look at it and it fires right back up so im stumped i need some things to look for any help would be great.