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I have a 2005 GMC W4500 , the check engine light has come on and I have a loss of power at 50mph. Any ideas

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Please see my tip at http://www.fixya.com/cars/r5932051-check_engine_light_check. These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.


we need the trouble codes to help you, please.

Posted on Oct 15, 2010

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