Ok, I too have been chasing this for about a year. 07 Denali, 6.2, 150k miles. When towing our 30' RV (~7500 lbs.) in temps over 85-90 at highway speeds, stalls when you stop (unless I keep my foot on the gas, and keep it above ~1000 rpms). Starts and runs fine after ~30 minutes.
After...