Try cleaning the mass airflow sensor. It is located in the ducting between the air filter box and throttle body. Remove it from the ducting, spray it with air intake cleaner or carb cleaner. Do not stick ANYTHING inside of it to wipe it with, just let it air dry for a few minutes, reinstall, and you should be idling fine. Worked wonders on my 03 2500HD with 8.1L. Also had much better throttle response.
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Today's Featured Article - Talk of the Town: Repairin a Gas Tank - by Staff. This interesting discussion is from the Tool Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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