This question goes along with the thread that I post the other day. When my car warms up it idles above 1000 rpm's and then drops down below 1000rpm's as it should. My question is what causes it to do that is it a sensor? The reason I ask the rpm's aren't dropping as low as they have in the past. Seems like it is ldling higher for some reason. I know it does this to get to operating temp but what controls it?