Bank 1 and Bank 2 lean
I am at wits end. I have 2003 f150 with the 4.6L V8.about 2 1/2 months ago it started missing. The code reader told me cyl. 3 was misfiring and bank 1 and bank 2 were running lean. I replace all the plugs, "wires" and the ignition coil on cyl 3.
The misfire code went away but the engine is still running rough and vibrates especially between 1000-1500 rpm. The lean codes are still present. I have replaced the fuel filter, replaced the injectors, cleaned the mass air flow sensor, replaced the DPFE sensor, and checked and cleaned the EGR valve. The EGR valve actuates (tested it with a vacuum pump), so I do not beleive that is the issue.
I have also unplugged the rear 2 O2 sensors to see if it changed anything. A code appeared that the O2 sensors were not sending so I plugged them back in. Due to this I donot think this is the issue either.
So again Help.