Testimonial: "Seems helpful -- I am wondering if you had to replace all four sensors or only upstream / downstream? Thank you"
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IF the engine tries to turn over but doesn't then the problem will be related to a flat battery. have a load test done to check for bad cell. battery life is unpredictable and will allow proper performance at one point but total failure a short time later.. Cold weather is a big killer of poor performing batteries
you may need to drain gas tank, they sweat pretty bad when not in use. you also can locate check valve on feed line to throttle body, looks like bicycle valve stem. deprewss needle and have someone turn the key on if no fuel comes out you have a bad or weak fuel pump. more than likel;y its just a little water in tank. if its water be sure to drain fuel lines as well by the way it. by the way it should spray strongly from this valve
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.
Try to start with a less expensive procedure. In addition to relay I would check the spark plugs, wiring set and distributor cap. Also coolant temperature sensor can be a problem. Try to warm up the endine block of car with dry heat (hair fan or heat gun, but gently). Sometimes it helps. If it works problem is spurk plugs, distributor cap or coolant sensor. Also would be usefull to chek the fuel filter.
But first for cold weather sometimes it worthy to use the injector cleaner/or octane buster and better fuel which evaporates better and less viscouse motor oil. And of course check the battery.