2000 GMC 5.3L P0157, P0172, P0175, P0332, Oil Consumption

My truck was mudded hard a few months back and since has run differently. When it is first started, the rpms do not hold up. The engine will bog down every few seconds and occasionally stall out. I ran the diagnostics on my Superchips tuner and these codes were found. P0157, P0172, P0175, P0332 0172 and 0175 are both system too rich, which i believe was a result of getting mud on my MAF sensor when I cleaned out my intake, and I ordered a replacement yesterday. The P0332 is the one that is throwing me though. It codes for Knock Sensor 2 Circuit Low Input (Bank 2), and I have no idea what this means or how to fix it. I am somewhat mechanically able, I can do small jobs and am hoping that this is somewhat easy to fix. Another problem that I have noticed is that I'm burning a lot of oil. I am not sure if this could be a result of the system running too rich, or the P0332 code. Any help would be greatly appreciated, thank you in advance!

check the wiring going to the 02 sensors in the exhaust system, maybe they became damaged from the off roading, could have also damaged the knock sensor wiring or sensors depending on where they are. Did the truck become submereged? the engine could start to burn oil if it's running rich enough because the piston rings could become washed down
could be an intake gasket issue as well
good luck and e-mail if you have any more infor or questions

Hey did you ever figure out what the proble mwith that code was ...i would liek to know also as im having the same problem
thanx