my 2006 GMC Canyon, 4cyl. 2.8 is stalling intermitently. What is wrong on 2006 GMC Canyon

Stalling happens when vehicle has been driven for a while or sometimes when idling for a bit, pulling up to stop signs or lights. I have had it to the shop twice, no results as no codes. Odd thing that happened recently..fuel gauge registered 3/4 full one minute then not long after registered 7/8 full, how can it go up, vehicle was running both readings, does this have anything to do with stalling?

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