I'm still getting used to our JK -- I've been stuck in the office all week and haven't been able to drive the rig around very much!
However, I have noticed that it vibrates a little bit when sitting still and idling. I don't detect any fluctuation in RPMs (both from looking at the tach and just by feel). I'm a pretty good mechanic, but my skills don't really extend to anything made much past 1971.
Is this typical or something I should look into? Our Jeep is a 2010 Wrangler Unlimited, 6-speed.