go get a prilosec otc 14 day pack and try them out.. Usually takes a couple days for it to get in your system and take control, but once it does, you will wonder how you lived without it!
I have a 07 5.3 and it always reads high. Read some where that these trucks are full when its comes up to the 2nd digit in the serial # on the stick. There's a few posts floating around about it.