I have a 2005 HD2500 with 6.0 engine. Getting the "reduced engine power" warning. I have search the net for 3 hours and came up with some good ideas. The one issue I did not come across is that the engine will not shut off. After flipping the key several times it will shut down with crazy noises. This last time sounded like the exhaust pipe got covered. Looking for any ideas on this. Thanks for any help. Tim, new member