Truck loosing power

[ASkipper]

I got a 2005 Silverado Crew Cab Z71 w/5.3. I have 295/70r17 Toyo Open Country MT tires on it. I was driving it Saturday on opening day of deer season- which means I had a lot of stop and go driving with a lot of mud, water, and dirt road driving. Truck started acting funny about mid day. I could press the gas pedal and it would not hardly go. When it got to about 2000rpms it seemed to take off. I noticed it did not have any take off power. It would not even spin the wheels over on a dirt road. I had to lock it in 4wd low one time and it still did not want to take off. It had the SES light burning and I checked it when I got home and it was for one of the knock sensors not responding. The SES light had been burning for awhile as I have not had time to fix it. I cleared the DTC's with HP Tuners and the power was back. I drove it Yesterday and it was fine till later on in the afternoon. Then it started doing the same thing. I know I could try taking out the Torque Management. I dont understand why it would be fine one minute and then no power the next. The SES light has not come back on and still the power is gone. What could I try the truck is bone stock down to the paper filter. Only changed the tires.