2012 Impreza stumbles when A/C turns off

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Recently my car has started stumbling when the A/C turns off. The RPM's go to almost zero, the oil light flickers, then the motor recovers to normal idle. When the A/C clutch engages and A/C comes on, the idle actually goes up a bit.
Has anyone experienced this? It seems like whatever is controlling the idle is dropping it too low when the A/C clutch disengages.

Note this only happens when in gear and stopped.

Recently I changed the spark plugs and replaced the air filter and cabin air filter. The car runs great other than this new issue.
 

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