Why is my 2008 Yukon Denali XL stalling?

Thanks for responding. Right now we are at 50-51 while idling. It only stalls after being hot, and then it doesn’t start up again until it cools down. Could it be the fuel pump module? When it runs rough and we have most of the issues it’s running around 40-43 psi

I don't think fuel pressure / operation is your issue. Look further into air intake concerns and ignition spark. Diagnostic testing is essential. Do you have any diagnostic trouble codes?