lean

Howdy I am new here i joined because I have the a 2002 Tahoe. I am also a member over at gmt400 (I am r422b) When it is cold my flex fuel 5.3 does not idle smoothly it stutters and the rpm bounces. Also I have codes P0174 P0171 P0440 P0449

Okay guys, here goes..... Bought my hoe last October with what appeared to be, at the time, a need for a simple tune-up and a possible vac leak. Also had a small exhaust leak. Nothing too major...or so I thought. Well, as we all know how the story goes, the hoe kinda grew on me and...