My car key comes out hot after turning it off?

I have a good ford escort se works like new had new engine installed before buying, and well i started working on it by painting it etc, and now my concern is that when i cold start the car it idles at it sounds like it will die, then after a while i pull out the key and it is hot not boiling, but hot enough i'm kind of worried any ideas please help thank you!

I'm not sure about the key, probably something electrical, bad wires? The engine run poorly may be one of many things, I would check your whole intake system and hook it up to a computer (like at an inspection station) and it should throw a code or two if its not your intake.