2010 Ford F150 4.6 3v 4x4 Trim slowly rises and will set open loop fault.

Hey Everyone,
I believe I have a pretty good one for you. 2010 Ford F150 4.6 3v (non-flex fuel) 4x4. Vehicle will set a p0171 and p0174. The Customer concern is that occasionally the vehicle will stall coming to a stop. I did not experience the stall coming to a stop or driving. The only code in the PCM was evap leak small in history. When I drove the vehicle to verify concern, I found no run-ability problems. Plenty of power and no stalling under normal driving. Brought it back to my shop and let it idle outside a bit. After 10 mins or so I heard a significant stumble. I hooked the scanner up and no codes at this point.I pulled data up on the Verus and short and long term trim for both banks were 0 and the fuel system status read (open loop fault) but still no codes.
I cleared the KAM and went back into data. The short term fuel trim slowly increased to 50 over a few minutes, then fuel system status went to open loop fault, trims dropped to 0 and the truck just about stalled. This will happen constantly over and over. I monitored fuel trim at 1500 and 2500 and total trim is about 20-30. Fuel pressure was 60psi. However, I wasn't happy with the volume the pump produced. Scope pattern on fuel pump module shows a nice square wave with 14 available and 14 used that runs at 60% duty cycle at idle, which is what the PCM is commanding. I pulled a current ramp and it had one commutator that looked shorted. Pump RPM was about 3400, which seamed low. I replaced the fuel pump and now have 65 psi. Trims are still the same. MAF has been changed out with reman cardone. Scan data shows about 3v from MAF with a wide open snap and .7 at idle. When I use the component test scop I can not get a pattern. I am not familiar with the sensor type. The Verus says it is a DC voltage sensor. maf.PNG Unpluged I have a 5v ref for the IAT and signal return.The MAF I have 2 pins that read 2v available voltage, a ground, and a 12v with the connector unplugged. This seems odd to me. Plugged in both 2v wires drop to 0. I shrugged it off at first since I had good voltages in the PCM, however I am thinking it may be a substituted value.
The truck also does have a small exhaust leak from a broken stud at the passenger side manifold so I cant rule that out, but I would think that would affect one bank only. I did smoke the intake and intake tube upto MAF and no leaks. I also capped off the brake booster, 4x4 actuators, and evap purge lines. Still same trim problem. Any suggestions?

maybe try checking fuel quality? 50% positive is very lean. dirty injectors?

I did check fuel for alcohol. It was 10%. When I did the pump I drained fuel and put good fuel in it. No change. I ran some sea foam through injectors as well.