Idle control valve,you said you cleaned it! OK, now after it warms(Eng.) what kind of idle do you have? Next it is of no use to clean the potentiometer, thats the electrical device on the right side of the air mass meter. That one little toy is what tells the eha to richen the fuel in a manner so that you do not have the sputter. In a carburetor-ed auto it would be called the accelerator pump,it gives the engine the little little boost of fuel. your system is not working.If you go to posts in my name you will find pictures and info from other members who helped me threw this very problem.NOW for the bad news that part seams to be discontinued,you may find some one who has one that is still good, Or you may have to replace the entire unit, if so I would try to locate one from a salvage yard. JNT