'08 Sierra codes P2135, P2101

franco

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2008 5.3 46k miles. Western NY.
Looking for insight on why truck seems to be missing/starving. A weeks worth of speratic good/bad running. Added dry gas, topped off with high test twice.
Today engine just stoped running when entering highway. It restarted after couple attempts, but it acted dead first, not even turning over. Local parts store ran codes and counter person said to test my fuel pressure? Probably fuel pump going bad. Am I missing something obvious?
 
Thanks to those who didnt reply...

A big thank you does go to my local dealer. They knew right away what was happening and verified problem with P-Codes. New Throttle Body installed today, under Warranty... Thank You GMC !!!
 


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