[Vandad123]

I hope someone can provide an answer to this issue as I have a 2018 SXT with 66,000 miles and it does almost the exact same thing. After warm up, sitting at idle in Drive, engine is rough, has not actually stalled yet but close. Transmission fluid is in good condition and good level, I am going to do an AT fluid/filter change very soon as well.

No other driveability problems exist-no lurching at idle, no hesitation, trans shifts fine, no codes, etc. Fuel economy is normal as well, average around 21 mpg in mostly city driving(80% city/20% HW)
I cleaned my throttle body and it didn't help.
I ran Techron through a couple tank fill ups-didn't help.
Changed PCV valve-didn't help

 

[Vandad123]

I was looking into this issue and the original post had attached dealer paper work alluding to a voltage problem, so they replaced the TIPM to no effect.

I know that the 2017-18 GC's had 2 separate recalls for bad voltage regulators in the PCM, specifically for stalling.

This could be a route to check for the stalling issues.

 

[Vandad123]

I find it really hard to believe that a new torque converter, rebuilt trans, and new valve body are the cause of this issue as it existed prior to to those pieces being replaced.

It has to be solenoid or PCM issue.