Yeah that's a 10.1" android head unit, and I've got Torque up on it.

The change is a result of the fuel pump swap yes. First pic looks like the upstream O2 is reading mega rich, second one looks like normal O2 sensor switching to me, maintaining a proper stoichiometric ratio. Downstream on a hot cat should always be flat or close to it.

But I'm far from an o2 expert if someone wants to correct me.

Edit - the double graph appearance of the second photo one is just a reflection, there's only two graphed values.

 

Final update for anyone running a forum search in 10 years...

Replaced all 8 coil packs and all 16 spark plugs today. Engine is running smooth as butter again. I ohm'd out a new coil and got 0.8ohm on the primary side, I did not test the secondary side. All 8 coils showed 0.8ohm primary. Plugs had no wear, but some, what appeared to be, ash fouling. I don't run any fuel additives..

I also did a leakdown at the same time. No exhaust or intake valve leakage. 5 cylinders have low leakage to the crankcase (normal), 3 cylinders have low to moderate leakage to the crankcase. Normal for a 200,000 mile engine.

 

I am suspecting my fuel economy is low due to worn spark plugs. I just ordered some NGK coppers to see if this will make a change. Most people get more than 10-12 mpg in their 2500 mega cabs, when I am getting no better than 7-8 mpg average and this is like 70% highway use.

I had a similar experience with my BMW X5. I was experiencing a slightly misfiring issue with no check engine light, which at the end was the coil packs reaching their end of the life cycle. BMW coil packs are sensitive to spark plug interval and if not kept up with interval will wear out coil packs sooner.

 

What really sent me down the coil pack or plug path was when I unplugged a coil pack and the random misfire became steady (obviously), but it was an identical misfire. It wasn't a pop like a valve, or a pre-detonation. And without any codes to go on, I nuked the entire ignition system. I'm really surprised by how much the PCM let slide without tripping a code. It was shaking pretty bad at idle, passengers immediately would note "Uhh, what's that noise?"