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Any mechanics on fedi? Partner has had issues tracking down an issue

Got a Mazda 3 2004 2.0L 5sp Manual Hatchback that's getting rpm fluctuations at idle when in neutral, jumping up and down between 650 and 1200 rpm usually after running for a little but is inconsistent.

- We've cleaned the throttle body & idle air control valve*, checked for clean movement
- Reset the idle memory
- Checked the Throttle positon, MAF and MAP sensors
- Had one CEL at random (P0507 idle air control system rpm higher than expected), occured long after the issue started and hasn't reoccured since clearing
- Recently replaced fuel filter, engine air filter, sway bar links & engine mounts
- Doesn't correlate with refueling, so we believe the purge valve system is uninvolved
- Doesn't correlate with AC on/off
- Engaging the clutch typical causes the rpm to drop back to regular levels

* Cleaning the IAC did make low speed maneuvering considerably smoother, maybe we just need a second clean.