5 and 2

BANK 1 AND BANK 2
Middle cylinders....A ford thing......:glasses7:
oops to late...
P0171 Code the majority of the time is a vacuum leak on bank one could be caused by clogged fuel filter like you had...
PCV hose and vacuum elbows shrivel up on this fords and the intake o/rings leak....Of course those will be taking care of ....