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Old 07-05-2009, 03:58 PM   #13
dozerboy
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Join Date: Mar 2005
Location: TX
Age: 26
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Re: Duramax Check Engine Light/ Glow Plug Problem?

I don't know that a mileage drop as anything to with the reflash it just makes the EGR cycle open and closed more IIRC. I believe I had the reflash, but my mileage never dropped.
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