2003 Yukon XL Denali. Was towing my camper and noticed the truck had no power. Put truck into reverse and it wont move. Almost like theres no throttle response. Put it in Neutral and have response. Trans was around 210. Was 97 the last couple of days. Let truck cool down overnight and it was fine until trans gets up to temp again. Feels like Torque converter is stuck locked? No CEL. Fluids are fine.