The first think to look at would be the Idle Air Control Valve, IACV. I have included a diagram of its location. On all models it is in the rear of the rear center of the engine compartment, except for the SHO. I included it too, just in case.
You can try cleaning it or you can replace it. Check the connections and any vacuum lines it may have.
Before you clean or replace the IACV, go to get the trouble codes pulled. They will help to diagnose the issue. It is a good way to look at the whole intake/fuel management system as a whole.
Most Advance or Auto Zone parts stores will scan the codes for free.
If you need any further help, I will watch this post for your reply and get back to you ASAP.
Images (Click to enlarge)
Wednesday, October 19th, 2011 AT 1:54 AM