2000 f150 5.4L misfire?

[jstewart007]

I have a 2000 F150 5.4L 4X4 which is misfiring. The engine light came on with the codes PO171, PO174, and PO302. The first 2 codes are Banks 1 & 2 Running too Lean, and the 3rd code Misfiring on #2 cyclinder. I've replaced # 2 COP and checked # 2 sparkplug. Truck still runs rough, and codes out PO174 & PO302????? I also using starter fluid sprayed for vacuum leaks NONE. Please help me with this problem? Thanks Jim

[KingRanchMan02]

How long has it been since the spark plugs have been changed? How many miles are on the truck?

[findian]

replace your 02 sensors aswell, sounds like your misfiring fouled the sensors