Possible causes – Faulty Oxygen sensor– Ignition problem– Fuel injection problem– Engine mechanical condition Tech description There is a factory service bulletin for the following GMC models: 2000-2008 GMC Sonoma2000-2008 GMC Sierra2000-2008 GMC Yukon2000-2008 GMC Yukon XL2001-2008 GMC Denali2001-2008 GMC Denali XL2001-2008 GMC Savana2002-2008 GMC Envoy2002-2008 GMC Safari2002-2008 GMC Jimmy2000-2008 GMC Factory Service Bulletin OBDII…