Well...after a run anywhere I eventually come to a stop. For about 1-2 seconds the engine stays at high idle, and then comes down to a nice smooth even diesely idle. It never stays high or low...always seems to come from a high idle down to a nice even idle. Never noticed this with my radio on? Is this a problem or the engine just coming down after a load has been placed on it?

It doesn't seem like a problem.