Re: pulsates when starts then shuts down after warmed up
Check all of your connections at the coil pack. Ensure that the coil packs do not have any corrosion under them were they connect into the base module or any of the connections, even plug wires. I had this same problem with my 2.2 in a 99' s-10. Pulled the coil apart, cleaned it up and and put di-electric grease on it, all better.
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sounds like you have a fuel pump problem, fuel pumps will usually get hot and then shut off allowing it to sit 30 mins lets the pump cool down allowing it to start pumping, the way you can test it is get a can of starting fluid the next time it quits raise your hood and spray some fluid down into the throttle body and if it starts and then dies it is most likely your fuel pump, hope this helps.
Replace the starter for the armature is swelled up when hot and biding against the starters fields in there starters casing. Upon cooling off the swelling goes down and the starter is able to operate again. Remember when metal gets hot, it will expand and upon cooling it will shrink back to the normal size. After so long it will quit working from being so deformed from so much abuse
check engine coolant temperature when it gets warmer, or at operating temperature, and verify that the temperature gauge is showing warmed up to operating temperature. If the coolant temperature sensor tells the computer the engine is cold it will over fuel and miss and the engine will die. When cooled down it will run fine until it warms up. Also could be coil if it starts missing after warmed up.