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Definitely the rough idle is more noticeable on a cold engine, watching the temp gauge closely, as soon as it hits the normal level the roughness goes away like 90% but I do feel it on a Auto start/stop re start for a few seconds and if I am over 30 minutes on idle sometimes it gets as the cold...

My JT runs rough at idle from time to time, dealer says there is nothing they can do since there is no engine trouble codes on the PCM. I had a 2016 JKU with the 3.6 that ran super smooth, I started to feel the rough idle around 1,200 miles now it has 4,000 miles. My brother has a 2018 JLUR and...