Fuel pressure too high

2000 S10 LS  2.2 Flex Fuel @ 165,000 miles; Been tracking down a P0171
Lean Bank 1 code with not much luck. Rough idle and hesitation when
accelerating thru 2nd to 3rd gear. Flex fuel filter is one week new. Measured
pressure pre-filter at 70 psi. Measured at the rail, still 70 psi! Flex model has
fuel regulator in the filter, no MAF sensor, and no PCV valve. New TPS,
smoke tested and found small leak where valve cover gas returns to intake,
and used carb cleaner around engine bay with no effects to idle rpms (1K).
Recently changed plugs and wires but not the coil packs yet. Exhaust
manifold was replaced along with the upstream O2 sensor attached to it.
Can't find any threads on too high of fuel pressure and what weird effects I
could expect the computer to produce. Does anybody know what reading I
should see pre and post filter on this model? I used a MicroGuard model
from O'Reilly's. At my wits end with this and feeling defeated.
Any ideas are welcome!