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I have a 2003 6.0 Liter with 133k miles on it that recently has been having some serious lack of power problems. When the engine is cold, it barely runs and sounds like it is running on about three cylinders. I'm hoping this isn't the end for the old girl here. I would like to get 300k out of her if possible. The oil has always been changed at 3-5k on a regular basis along with factory updates etc. I've got it in the shop right now running tests to determine what is happening. Any ideas?