idle issue

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I took my LC on a long trip and while at idle for long periods of time (2 hours), the RPM's started getting a little rough. No lights, never stalled or ever close...but from a consistent 7-800RPM's at idle with AC, it would occasionally drop to 4-500 and jump right back up. It wasn't "rough"...

Hi all, I'm chasing an idle issue and it might be idle air control (IAC) valve related. Mine wasn't moving, but I disassembled it, cleaned it, and it moves now. What I learned while cleaning it is that the length of the moving part is adjustable. I made a best guess at installation depth, but...