You are doing it the wrong way, replacing components without understanding what and how they work.
For a start, you need to understand what is wrong and proceed from there. You have a fault with excessively low idling speed and the system you should be working on is the idle control system.
If the Malfunction Indicator Light is not showing, that would be a simple fix, clean the throttle body, IAC and readjust the idling speed to specificatins and you should be good to go.
The above link or links related to it should be helpful.
Sunday, December 9th, 2012 AT 8:52 AM