I stopped to top off my gas tank when I had the problem. After getting gas, I started my Jeep (04 LJ w/ auto trans) and it was idling really rough. Felt like it was only firing on 2 or 4 cylinders. I gave it a little gas and after about 10 seconds it smoothed out. I got a little nervous so I let it sit for about 10 minutes then started it again and it did the same thing. I sat for a few minutes and everything was ok.
My LJ has a 3.5 RE lift on 33's so I know the trans is I also thought maybe the thermostat stuck for a second then opened up which caused the rough idle.
I'm not real up to date on the newer Jeeps but I do know that the thermostat would have already been opened up from engine heat soak while you were stopped for gas, so its not likely to be a 'stat.
I'm thinking maybe an oxygen sensor since you were at an elevated height and the computer may have had to readjust the computer settings to compensate.
I'm just guessing though.
Thats just my
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RED JEEP CLUB MEMBER #92
'92 WRANGLER, 2.5 Litre, 5 Speed, Rag Top, Superwinch LP8500, Cepek 130W Driving Lights, 31x10.50/AT with no lift, Of course! It rubs!