I just bought my first K-5 yesterday. It is a 85 with a 305 and manual tranny. Anyway when you first crank it, it idles at around 2000 rpm and if you wait a min and then pump the accelerator once it will fall back to around 1500. This seems normal to me, but then if you start to drive it the idle constantly changes. It will even idle at 2800 sometimes. I have seen it idle any where from 900 to 2800 for no apparent reason. The thing also deisels after you cut it off. It only does it if it has been drivin enough to get warm. While it is deiseling the choke light comes on. This is my first real experience with what i believe to be a crb problem, any help would be greatly apprecited.