P0175 Code - Bank 2 Rich

[cebra]

I have a 00' 4.8L in my truck (can't recall engine code) that I have drove about 25K miles on now. About 1K miles ago, it threw a P0175 code and I started trying to resolve this without success thus far. Any ideas on things to replace to try to resolve this? I cleaned the MAF, replaced MAF with another junkyard variant, ran injector cleaner through it and no luck. The 02 sensors were new 25K miles ago but they are cheaper models. The truck has always appeared to run a little rich but I drive it at about 750 miles a week and it runs pretty good, maybe slightly down on power.