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My car runs good when it's cold but stalls once it warms up? ... In this situation, you can usually re-start the engine once it has hada chance to cool back ... it'll fill-up and exits fuel right up and out the vent tube which dumps it down the middle of ...
the coolant temperature sensor is faulty
when cold the sensor tells the computer its cold adding more fuel into the engine, when warm the engine needs less fuel so the temperature sensor tells the computer its warmed up and to use less fuel. when this snesor goes bad it always reads as if the engine was cold so the computer adds more fuel than needed making the engine not start. Trust me on this ive had this problem happen to me before
Try pulling the vacuum line off of the EGR valve when the engine is warm and starts to sputter. If it runs good cold and then dies when warm and won't start again until the engine cools it is most likely a bad or sticking EGR valve. Try the procedure to confirm it is the EGR. You can check the internet for location and an image of the EGR valve for your specific car. Please rate me on this answer.
You need to find oput what you loose when the truck shuts off, all you need is Air, Fuel , and spark to run one of the three are droppuig out when it stalls and will not run. Chech the carb for gas it sounds like you have a weak fuel pump.
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.
Sounds ike the fuel pump died. As they get old and your car is about that age the start to overheat after being in use for a while. They stop pushing out the fuel consistantly and then stop working all together. Sometimes letting them cool back down will allow you to use it for a short while before it dies again but in your case it sounds like it just gave out. Remember fuel in the tank helps cool the pump when in use.