2001 Civic LX stalls when clutch is disengaged

I have a 2001 Civic LX that stalls, or nearly stalls when the clutch is disengaged. It typically only happens when it is warm out and the AC is on. It starts and idles fine, it only happens when the load is
removed from the engine and the rpms fall down to idle level. Sometimes it will dip to 400-500 and recover, but sometimes it will stall. I have checked the spark plugs and air filter, but thats about it at this time. Any ideas?
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