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Does fuel pump run ? Remove fuel cap. Have someone crank it for you,you should hear fuel pump running. If not bang on bottom of tank while cranking. If it starts fuel pump will need replacing , if not check for power to pump, if it has power,replace pump. If no power, check relay for operation
My guess would be something electrical that is not working due to the temp. Like a relay. A relay could loose magnetic power for a few tries then start working. Or the engine temp sensor could be out of calib and telling the computer the temp is 90 degrees when it is only 50. You could use a scanner to read the sensors and look for something not right. Without knowing what is missing in the equation its going to be tough to diagnose it. You really need to know if you are loosing voltage to the coil or the injectors or if the fuel mixture is too lean, etc.
yes you should be able to hear the fuel pump run for about 5 seconds once the key is turned to the on pos. check to make sure you have spark. if you do try having someone spray air intake or carb cleaner into intake manifold while you crank. If the truck starts right up for a second (or stays running as you keep spraying) Id say you have a bad fuel pump and id change the sending unit also. (First check the fuel pump fuse and fuel pump relay) GMC and Chevy are nororiously known for having bad fuel pump/sending unit problems. I have prob changed over 60 myself.