Thanks for your reply. I did clean it out again just to be sure about it. When in park or neutral it idles between 1000 and 1250 rpm. When in drive or reverse it idles at about 750 rpm. So I need the potentiometer? I will have to start looking for one. The car is amazing for an old 300k mile beast, I have no problems at all that I haven't been able to fix asides for this which has to be the most annoying thing I have ever dealt with. Hopefully we can get it fixed up.