If you are getting a check engine or dash light check for codes
Really I think it could be fuel, air or back pressure. It is a good thing to have codes sometimes.
Below a few thing which my help

http://www.autotap.com/problem4_engine_hesitates.asp
https://www.youtube.com/watch?v=bDCaAZedVYY

https://www.yourmechanic.com/estimates/gmc/yukon-xl-1500/engine-hesitates-during-acceleration-inspection
https://www.youtube.com/watch?v=cXHfJTbcSgY


https://www.youtube.com/watch?v=-SRgNXKoOC8
https://www.gm-trucks.com/forums/topic/200207-yukon-xl-denail-2009-severe-hesitation-and-poor-gas-milage-real-head/