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Not running right

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My dad's '02 2500, 24 valve auto has no power. He said it started acting up when they went to the ultra low sulfer diesel. no codes. I seen the thread for cleaning the prescreen on a 12 valve and took the lift pump off to clean but the screen in it was very clean. When the key gets turned on the lift pump stays on for about 25 second wich is normal, any suggestions. I am getting used to turbos on my car but a deisel setup is way different. I am going to clean the iat and map sensor, do I just clean the connections or take the sensor out and clean that part too? thanks
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