Adjusting Idle Speed.
 

Is this something that can be adjusted manually? Or do you need to access and 'reprogram' the computer?

Edit:

I have been doing a lot of reading and it seems the idle is computer controlled - as I suspected.

I was looking to adjust the idle myself because I (like many) have the dreaded idle vibration and changing the idle speed depending on the season is helpful. I am just tire of taking it to the dealer to get it adjusted.

As a side note.

I dont think the idle vibration is coming from the engine. Instead, I suspect it is the transmission itself that is causing the stoplight vibrations.

BTW, does the 3.0 use the same auto tranny as the 4.4?

only dealer can adjust the idle and it cannot be done manually .( 3.0i used GM5 from 2000-05,06-08 using GM6 and 4.4i used ZF tranny)

Yes the tranny's are different...

Thanks for the input.