Rookie question, but how should I go about "unscrewing" the IAC from the throttle body?

 

What I mean is; whats the best way to reach it? Anyone?

 

I just removed the throttle body on the last one I changed out.

 

Is it worth doing all that just to clean it?

 

If you are trying to clean the IAC, you should really pull the TB and clean the passages also.

 

Sorry for the craptastic pic, but is that red thing my idle stop plug?

 

OK, sounds like good advice.. lol. Thanks.

 

The red thing is a vacuum cap that is covering the vacuum port for your charcoal canister.

To my knowledge there is no such thing as an idle stop plug. There is a throttle stop, which is on the other side where the linkage is, it prevents you from "over opening" the throttle blades.

 

Okay, makes sense. What I'm looking for is the Minimum air adjustment screw..
Saw a pic that had it on the upper right corner of the throttle body, but it's not there on my car... it's an 89 IROC-Z 5.7L 350.

 

It's covered with a cap that you have to knock out. It on the top driverside corner of the TB. Right where the linkage is.

I am assuming you are having idle issues? if you have no vac leaks or other problems, follow this article.

https://www.thirdgen.org/tpimod2

 

Yup idle issues...
when I start it, it idles high at first, then jumps around, then stalls.

 

sounds like you have a vacuum leak.

 

It could be the throttle positioning sensor (TPS) also. It's located next to the IAC. They are about 20.00.

 

Yup. I am almost positive there is a vacuum leak.

First I am going to find and repair the vacuum leak, then I am going to give a good cleaning to the IAC and throttle body.

Then, I am going to make sure everything is set correctly.

Just need to make sure I know how to do everything. Thanks for your help!