After towing the other day (everything was hot, see my other thread) as I am letting it cool down while unhooking the trailer, it goes into a high idle?? Is this normal to help it cool? When I hit the brake it didn't drop down until I put it into gear. Also, the PO had an Edge juice w/Attitude on it, would that leave anything on the ECM that might cause this or for it to run hotter than normal??