codes p0174 po171 98 f-150 runs great

have these codes po171 po174 too lean truck runs great took to mehanic codes first were 171 174 175 he put new fuel filter check engine went off 100 miles later came back on oreillys said now just have 174 171

i would suggest getting a can of carb cleaner and spray it around the intake and all around the top of the engine

if you can find someone with a scanner that can moniter the o2 sensor and long and short term fuel trims

if you get to use a scanner watch for it to run rich while spraying the carb cleaner

if not you may be able to watch the motor smooth out some for a second

hope that helps you some

p0171 o2 bank1 system to lean,p0174 o2 bank2 system to lean.
check for vacuum leaks, check fuel pressure, check boro pid reading, check dpfe sensor voltage, check for o2's swiching properly.
p0175 02 bank 2 system to rich.
based on the prevous p0175 code i would personaly blame the 02's. and replace them both