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I'm a Newbie on Forums, So I am posting this same post to several Groups I have Found
2012 Grand Cherokee 5.7 Hemi

In Feb 2022 My jeep was running rough, I had Check Engine Lgt, Lightening Bold and a bunch of codes, most relating to Throttle Body and Acc Pedal. Sometimes I would lose power while driving, But I could pull over and wait a couple of minutes, then start back up and drive normal. Sometimes it would not start until about 5 or 6 tries. I took it in to shop and they replaced throttle body, accelerator, and a couple of sensors (crankshaft/oil pressure). When I picked up vehicle, it took 10 miles before my panel lit up and started running rough, just like when I took it in. I took it back to them, and they couldn't figure out what went wrong. They did the reset/relearn with their computer, and that did not help. They kept it for a couple of days, and it drove good for about 2 weeks, then same problems came back. They sold the shop, and I didn't have $$ to start all over, so I lived with my problems. It happened about once a month and resolved itself.

In November 2022 it started running rough, losing power, on a daily basis. I also had misfires on 1 cylandar, and a bad water pump. I took it to a new mechanic, described my issues, and he said since I used aftermarket parts the first time, that was most likely my problem, I bought mopar throttle body this time. I drove 20 minutes to this new shop, and had no problems getting vehicle to him. He put all new spark plugs, a coil for the one cylandar that was misfiring, repaced water pump, changed oil and installed new Mopar Throttle Body, He called the next day and said I would have to replace the Accelerator Pedal also, So I bought new Mopar Accelerator Pedal. After he installed the Accelerator Pedal, He called and said that it still was not running right, And the only thing he new was for me to get a new PCM. Basically told me to come pick up vehicle. He FAILED to mention that my Jeep had No Power, and Little Acceleration, So bad that all it would go was maybe 25 mph with pedal all the way depressed.. I had to tow vehicle home. Decided to bite the bullet and take it to a dealer, but they are 3-4 wks out for appts. I found a mechanic who has a good reputation and experience with Jeeps. That appt is 2 weeks out. Anybody had this issue, I have tried the manual reset/relearn procedures and they do not work. When I start it now, It is rough Idle, RPM is 1000 and does not change when accelerator pedal is depressed to the floor. Any help is appreciated.
 

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There's a thought, your Jeep up to date on recalls and TSBs?
If in doubt Google Recalls for a 2012 Jeep GC for a list of recalls and Technical Service Bulletins.
BTW dealer service depts reflash the PCM with latest frimware upgrades when doing a fault readout.
 
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