Bank 1 lean - bank 2 lean

[anco989]

I have the bank one and two lean codes one my 99' sport (4.0 OHV) i replaced plugs, o2s, mass air sensor, and fuel filter it has 82,000 miles and i have reset the computer n the codes always come back the next day (yes i kno this has ben posted a thousand times and i apologize) but is it more than likly my intake gasket ... all vacume lines look good and its been eating gas alot more and it a 5spd and the stick is fairly shakey at idle

 

[2000XPLORERSPORT]

it is more likely the intake gaskets for these are known for that issue.there is a good thread with pics of how to replace the gaskets on this site.i have the same codes.i tightned 4 of the 6 nuts that hold the upper intake plenum down and the codes/check engine light has not came back sinse.that was over a week ago.i noticed when my check engine light would come on with them codes,it was within the first 5 minutes after i started the truck.and only when its colder.like 35 or lower.but after the truck warms up,i never got the check engine/lean codes.

 

[2000XPLORERSPORT]

here is that link on how to replace the intake gaskets if you want to give it a try.im waiting to see if my check engine light comes on and if the codes are p-0171, p-0174 then im going to replace the intake gaskets.but check out this link.
http://www.explorerforum.com/forums/showthread.php?p=1555157