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K3500 Rough Running

kens219

By kens219
in Ask A GM Technician

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kens219 New Member

kens219

Posted
Posted

hi

I have a 96 k3500 7.4l that is running rough at idle and useing a lot of fuel.just changed plugs cap rotor wires (checked for right order multiple times)when I pulled the new plugs # 2 6 8 were black and # 4 was clean.no codes. 55 lbs of fuel pressure running after I shut eng off pressure stays the same

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