Unstable idle

[t_marat]

Long time ago I had a problem with engine stalling whenever I switch to neutral gear. Tachometer would just go straight to 0. But if I let go the throttle slowly, lowering the rev to approximately 1200rpm, then idle would stay fine. This problem would only occur when the engine was hot. I solved this problem by replacing the MAF. Old MAF was dead. After that I didn't any idle problems for about 4 months. And now it showed its ugly head again
After switching to neutral, idle would go down, very close to stalling. Then swing up to about 900rpm, then down again and up. Oscilate a little before settling down. I changed the ICV to another one, same thing. What could this be? The problem shows itself when the engine gets hot, at operating temp. Until that, no problems whatsover.

[t_marat]

And I don't seem to have a vacum leak.