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  1. Engine & Drivetrain
    Hello everyone I am trying to help my father in law with his 2011 GMC Acadia. It has the 3.6 VVT engine and 144,311 miles. Last week he was complaining that it would intermittently lose power so I pulled the codes. I asked him if the spark plugs had ever been changed and he said no. I...
    cylinder misfire fuel injector multiple misfires power loss random misfires
  2. Engine & Drivetrain
    I was getting misfire codes from the front engine coil packs. So I changed all three out plus plugs. Ran great for awhile and then started getting misfires again so I had the back 3 coil packs and plugs changed out including the intake manifold gasket. Now I am getting random misfires. What is...
    2012 coil packs injectors plugs random misfires
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