Autozone will only be able to pull a code when the light is on. So if you are out and about and he light kicks on go get it done then.
Once you get your code then you will be able to get a proper diagnosis on what the problem is. Also to get a free scan you can go to Advanced Auto Parts if you have one of those places close by.
I really wish I could tell you exactly where the Idle Air Control Valve is but I am 50 miles offshore working.
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