Issues with vehicle stalling intermittantly while slowing or stoping.

Started it, backed out of the driveway, put in drive, started up the road which has a moderate incline, floored it, let off the gas about 150 yards to 200 yards away, once RPMs dropped it shut off within a second or two. Pictures below has a red line at the spot where I let off the gas pedal.

Next picture is with the red line where it stalled and shut off.

This is the HO2S sensors and short and long fuel trim at the point where I let off the gas pedal.

This is the HO2S sensors and short and long fuel trim at the point where it stalled and shut off.

Okay, thanks for the graphs, it looks like you may have a vacuum leak or a dirty throttle body. Let's use this video to test for leaks.

https://www.youtube.com/watch?v=LRKWV4Are5c&t

Next please go over this guide to help service the throttle bore with instructions below to help you as well.

https://www.2carpros.com/articles/throttle-actuator-service

Please read the guide before you begin. Check out the images (below). Let us know how it goes.

Update time and I'm pretty sure the engine locked up. After the last event I couldn't get the engine to crank. I thought it was a bad battery so I went ahead and purchased a new one. Tried again this morning. I could hear the starter solenoid click but the engine didn't crank at all. I put the new battery on a charger and tried again about 10-20 minutes later. The engine cranked very slowly once or twice and then just stopped. Put the battery back on the charger for a bit. Tried again, solenoid clicked but the engine didn't crank. Thought maybe I need more juice so I pulled my Audi Q7 which is diesel up beside it and put jumper cables on it. Let it charge for like 30 minutes. Tried again, I can hear the solenoid but the engine doesn't crank.

It seems kind of odd that the starter would go out at the same exact time this is happening so I decided to pull the serpentine belt off and try to start it, in case I had a pulley or something locked up. I can turn the pulley's, alternator, and water pump by hand with no issue. Still, just a click with no crank.

So I decided to try and turn the crank by hand. Below is a video of me doing that. I have the vehicle in neutral. I can't get it to budge and I'm scared to put too much force behind it and snap the bolt off.

What do you think? Do I need to put more force behind it? Did I break a rod or something? I would have expected some very loud noises when it stalled and died if I had. I'm not for sure at this point.

When trying to start the engine today with the new battery and even after charging it, looking at the scanner the voltage was dropping to ~6 volts. Makes me think the starter is getting juice but it's in a bind physically which if the engine is locked up would make sense but maybe I'm wrong.

Do I need to pull the starter off and get it tested or should I just tow this thing to a cliff and push it off?

Yep, that does not look good, I would check the engine oil, then remove the drive belt and spark plugs and try to rotate the engine again. Thanks for the video, it helps. Let me know what you find.