Sounds like the fuel filter is clogged time to put a new one in the fuel line .
I have the same problem. i was told it is a computer problem and no body knows why! but if you disconnect the battery then disconnect the black side of the computer for 15 minutes or so then replace the black side of the computer then replace the battery it will start and run. they tell me the computer thinks something is wrong with the car and it goes into a limp mod to get you some were safe then shuts down and i can not find any body to tell me why it seams to be a big problem with the GMC Jimmeys of many years !!!!
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