2000 Chevy boxtruck 5.7, tries to start, won't stay running. Any help where to go next?

vintagevinvintagevin Member Posts: 1
edited January 2015 in Chevrolet
Hello There,
It got frigid cold here two days ago and my usually dependable 2000 Chevy box truck would not stay running. I thought lines may have frozen, I thawed everything, changd fuel filter, made sure pump works, changed Mass Air flow sensor, air filter, tune up, There is fuel making it to intake. When I turn it over it starts for a second and just stalls, it will not stay running!! I am going nuts losing work money by the day!! Any help out there as to where I go or change next?
Thank you,\
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