was driving my truck to work and engine light came on and started to idle badly, noticed it miss firing at stop lights,in park and slowing down. took it to the local AZ and pulled codes and stated cylinder 1 and cylinder2 miss firing. so i bought 2 ign. coils(45.00each) and two sparks plugs(2.99each). I unhooked the ground on the battery and replaced them. put everything back on started the truck and no engine light BUT NOW after i let it warm up it started to miss fire again took it for a quick test drive and the light came back on! <i did everything right> i took it back to AZ and they pulled the codes again this time it read cylinder 1 and cylinder 2 miss firing again! and also bank 1 and bank 2 to lean. manager there who used to work for ford said that the bank 1 and bank2 is the oxygen sensors (needed to be replaced). what should i do? why would i still have miss fires on the same cylinders? Has new oil change (castrol syn blend) new air filter(fram), cleaned the throttled body(was dirty), cleaned maf sensor(carefully), new fuel pump(expensive), new fuel filter, new pcv valve, and hoses. my first ford truck and already wanting to throw it off a bridge

 

check out some of the posts on the EGR and DPFE. These will cause all sorts of problems and codes, not sure what code #'s. I am going through the same diagnostics with my older 4.6. You need to look at the vacuum lines for carbon deposits and clogs.