I just dont understand the problem im having. I got a rebuilt motor and its still doing the same ideling problem i used to have. Some times i start my car and after its warmed up the idle kicks down nicely around 850rpm. And other times it wont kick down at all stays at 1500 rpm. I can also feel when its going to act up while im driving because when im going down hill and my cars still in gear with my foot off the gas it miss fires and sure enough when i come to a stop my idles at about 1200rpm. What do you guys think it is??? More often than not its idleing high. I even set my base idle at 750 and it dident help.