1997 f-150 PROBLEM

this truck really drives me nuts... i have the check engine light on...... its running a code that says its lean on both bank 1 and 2...... okay to much air......... i have had mechanics telling me its the o2 sensors replaced those not them, mass air flow sensor replaced that not that....... could be an intake leak checked that with 2 bottles of starting fluid didn't rev at all........ changed the fuel filter and fuel pump.... guess what not that either..... nobody can really tell me whats wrong with it so if any one mite have a guess please fill me in........... thanks alot.....:banghead:

Check and clean EGR valve. With a scan tool check short term and long term fuel trim.