Intermittent low power on slow acceleration

I've got a 2004 GMC Yukon XL SLT with the 5.3 and AWD, 82000 miles. I replaced the water pump and air filter three weeks ago and since then have had the truck feel like it has low power at a normal acceleration from a stop(not sure it is related, just FYI). I've read multiple threads on the Reduced Engine Power message in the DIC, but have yet to see the message myself. I do not have to shut the truck down to fix this like I've read about with the Reduced Engine Power, just let of the gas and try again, then it goes. No CEL's or messages as of yet, at first I thought it could be a transmission issue but cannot recreate the issue as hard as I try, it's done this 3 times in the last 2 weeks and only from a stop, not while cruising or under hard acceleration. I know this is not much to go on but it's all I've got. Please let me know your thoughts.

Thanks,
Chris.