Back with 02 question
 

So im still getting lean on bank 1 and bank 2 on my 01 Sport Trac. On 2nd set of o2 sensors. Truck feels a lil weaker than it used to. Noticed, that sometimes when i stop, the idle drop, and the enginge shudders, and it acts like it might shut off, but doesnt. After about 3 seconds, it levels out, and everythings ok. Any suggestions? Im about ready to just take it to the mechanic, and let them deal with it.

Any ideas?

That sure sounds like a vacuum leak to me. Probably an intake manifold gasket, since it's lean on both banks.....

Yeah, dont want to mess with that. To the mechanic we go!