2006 Commander gremlins
 

New here...hello. My Jeep is having a tantrum. It has been flawless for the past 7 years. Now it seems possessed. It started stalling while driving. Engine just shuts off. After this happens, the cruise will intermittently not work (won't even "turn on"). Then it got stuck in 3rd gear. It also has developed an erratic idle.
Per dealership diagnosis, I replaced the Solenoid Pack and it shifts correctly now, but trans fluid is "disappearing". I replaced the TPS, but it still stalls and idle is erratic.
Just had it scanned and it has the following codes: P2074, P0068, P0944, P1684 and U0401.
Anyone have a clue where I should start? Thank you.

First, try disconnecting the battery for a little while. If that does not work, Google the meaning of those codes to find out what is causing them and start fixing one at a time.