Thanks! The original problem is that the idle will hunt or stay high (1500 or so) As you can see from the pic I have a meter hooked to the idle control valve. When the idle hunts I can see the voltage rise and fall from about zero to about 5 volts and it is indeed changing the idle as the voltage changes. It's almost like the computer can't make up its mind where it wants the idle to be. Problem gets worse when the engine is hot.