I have a 1995 pontiac Trans Am with a 5.7 . It will crank and run good until you park it. When you park it for a couple hours it will spin over it will not fire up. I have replaced the fuel pump twice , fuel filiter several times, had the computer checked, all sensor replaced including the whole disturber ( which lays under the water pump). When I bought the car the security system was bypassed. I had some trouble in Tenn. and had some KNOT HEAD work on it. They replaced the computer the switch and fixed the wiring problem. That happen before I done all that I did. I feel its the security system that is causing the problem. I need to know how to bypass the factory securtiy systems.?

 

You need to work out what your actual problem is first.
Security takes out the starter and the fuel injectors so highly unlikely this is your starting problem
As you mention it is only a hot start problem i would be looking at things that go belly up when hot ; the coil /ICM/ etc
Or the fuel injectors breaking down when hot.
Do a ohm test on the injectors ; Test both cold and hot and report back what the ohm readings are
In any case if any of the reading are below 12 ohm that injector is gone and needs replacing

 

As vetteoz stated check those things out but also post back and let us know what you find.