I've got a 2004 Rubicon with the 4.0 engine and automatic transmission. It has about 1000 miles on it. It runs great, but after it is warmed up the idle goes down to about 400-450 RPM's on the factory tach. At that speed it is a little rough, but not bad, and it never stalls or does anything out of the ordinary. If I turn on the AC or put it in neutral it speeds the idle back up to about 600. I suppose I'm being over sensitive becuase this is my first new car for a long time, but I'm used to seeing engines idle about 600 to 800. Idle speed is controlled by the computer and I can't even find the speed listed in the factory serice manual or on the sticker under the hood.
Is what I'm seeing normal for the Wrangler?
Thanks for your time.