I'm also having excactly the same symtoms Yutsuya, has there been any solutions to this problem?
I took off my IAC and it is spotless and operates smoothly, should I clean it anyway?
I also don't have an OHM meter, is there anyway else I can see if my IAC is working properly? (like if I start the car with it off and plugged in should it move?)
thanx
-jeff