Hey guys,
I am in need of your knowledge in the automotive world!

So the other day I went mudding in my stock 01 silverado 1500 z71 5.3L 4x4 on 33s....
I took way too big of a hole and got my truck stuck up to the doors in muddy water, (it died when it got stuck) The truck was under water for maybe 20-30 min, On the way home my truck started acting funny, It has a wierd loping idle and when driving it"ll have a erratic throttle. I put a OBD2 code reader on it and the codes p0102 (mass air flow, low input) I borrowed my dads maf and it didn't change anything, and p0174 (system too lean, bank 2) came up! Thanks too anyone who knows my issue!!!!

 

I would look under the truck at all the electrical connectors and clean them. They could have gotten wet causing your problem.