Why does my s10 run rough until it gets hot, and not crank good after it is hot?

What is your question?

When the engine is cold the truck runs rough at highway speeds, but while accelerating runs alright. When the truck warms up it starts running fine. Also, i dont know if problems are related, but when it gets hot it is hard to crank until it cools down. It also has stalled for no apparent reason. But next day it crank right up. I assume after it cooled off. We have replaced fuel pump. The pressure is fine on it. New fuel filter. It has new plugs and wires. Any help would be appreciated.