I have been haveing a problem with my car idleing at 1200rpm at startup and 900-1000rpm while sitting in traffic in gear, it would also idle really rough at times, it sounded like I had a really wild cam. Well today I took off my TB and Plenum and cleaned them both, I also cleaned my IAC and put in a new coolant temp sensor because I read that when it goes bad it will tell your computer that it is cold, so it's constantly running rich. I finished and started it up, it idled at 1000rpm than as it warmed up it dropped to about 750rpm, and it was a much smoother idle. I went for a short drive and it runs so smooth now I couldn't believe it, I stopped at a stop sign and sat there in gear for a little while, it idled smooth as glass between 700 and 725rpm. If anyone has the problem I did, you should do this right away. It was well worth the time and small amount of money, it was $7.99 for the coolant temp sensor and than you have to buy coolant and a can of carb cleaner.

 

where is that sensor again??

 

coolant temp sensor

 

Coolant temp sensor is in the front of the intake base, has 2 wires going to it... should be a yellow and a black or dark brown wire. Its right next to where the bypass hose hooks up to the base.

 

he's right, and it's very easy to change.