New to this forum been fixing up this old truck for a lil bit finally had no check engine lights running 13-14 mpg with 200k from 7-8 mpg was doing great and all of a sudden system lean codes cant find a big leak fuel pressure is fine have changed crankcase breathers, pcv, fixed a few pin sized leaks in vacuum, did a tune up, oil change, a couple o2 sensors awhile ago and no better gonna change map sensor and idle sensor today what else could it be im stumped if anyone has an email i can send scanner info if that could help im not to savy with understanding alot on scanner just basics diy guy but handy with a wrench and grew up working on cars my daughter is 16 figure her first truck my newest vehicle lol