why does my truck stop running after it get,s warmed up.

you might look to see if you have a bad fuel pump or ignition coil. both of those could cause the problem you describe. I used to have a dodge and had the same problem happen to me and had to replace the coil. I also had a ford with the same problem and it was the fuel pump. does it happen all the time or just when you are under a half a tank of gas? If it is all the time I would start at the coil. If it only does it when you have lower fuel levels then start with the fuel pump.