Need Help.....7.4 lean bank 2

[weaponoffreedom]

need help........

yesterday.........threw codes for MAF and others,........checked LTFT on bank 2 ans 1 and is was @-2%, nearly perfect.........running fine......reset code

today......no code.....noticable knock.....checked LTFT +17 at times, bank 1 ok.



any thoughts?????

 

[RichLo]

Injector or o2 sensor