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code p0087


al1939

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2004 2500HD duramax, will not shift gears unless accelerator is released momentarily. sometimes it will shift fine but will only go 65 mph. also code p0087. i will clear code and it will run fine for maybe 200/300 miles. I have replaced fuel filter. Could be bad fuel, trash in fuel but not sure. have a 60 gal aux fuel tank that feeds directly into factory tank. will remove tank and check for debris. Any suggestions.

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