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Does it ever trigger a transmission trouble code?
Have you checked the fluid level yet? These jeeps are notorious for a torque converter stall when the fluid level is low.
When you are checking the transmission fluid the vehicle is idling in neutral right?
You could have a stuck torque converter clutch solenoid in the valve body. Fixing it would require replacing the torque converter clutch solenoid or valve body.
You might also have a dirty throttle body that is acting like a stuck TCC causing a low idle and stall. When is the last time you had the throttle body cleaned?