I have the same problem plugs won't fix it. I have a feeling it is the IAC. I will be replacing mine next week. My car has been doing it for over a year so it isn't anything major. I went as far as to change all the mounts. So i'm sure it has to be the IAC. But could be wrong.

95 contour (All the usual mods and then some.) Trying to sell four wheeler so i can buy turbo.