Engine temperature starts to go up it will gradually start to stall?

Did the engine have this issue prior to disconnecting the battery?

I just answered this in another post a few days ago. Go out and drive the truck at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals. In the unlikely event this doesn't solve the problem, do that again while holding the brake pedal up with your foot. Coasting meets the requirements for "minimum throttle" to be relearned after the battery cable was disconnected, but if the brake light switch is slightly out-of-adjustment, the brake pedal could vibrate, turning on the part of the brake light switch that cancels the relearn.

There can be other causes of low idle speed, but this is the only one that is caused by removing power from the Engine Computer. It happens on every Chrysler product, and is so common, most mechanics either perform a short test-drive for their customers or they inform them of the need to do this simple procedure. If you don't do it, you'll waste hundreds of dollars on unneeded parts, and still never solve the low idle speed.

These codes are similar and are most likely causing your issue. I attached the code detail for the P0320 because I am sure that test will help you find the issue. The other code is for intermittent loss of cam or crank. If you fix the P0320, then I am sure you will fix the P1391.