AC idle drop, sometimes stalls

[PLP]

I hate the search function...

How to search for AC and idle drop?
Two letters are ignored or I am not finding anything at all.

I bet the question was covered a few times.

So here it goes.
2003, 2,7, 5 sped MT.
The way the car behaves - when I am driving (no AC), it seems to be generally fine. Sometimes the idle drops a bit lower, but recovers. Situation like this: going in 3rd gear or so, rpm maybe about 2000, coasting, 1200. Depress the clutch, idle drops below 800 (like 500) and recovers to 800 more or less. Steady from there.

With AC - if I was to repeat it, sometimes it would drop to 400 or lower and from time to time it does not recover, i.e. stalls, dies.

From what I read it might be ICV, but is it?
What else?
No other problems - starts fine, power is there. Rather smooth power delivery.
Filters, sparks, coils - all less than 10 k miles.
AC blows cold, like cold enough to make it comfortable cold.