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Why is the service engine soon flashing on my96 gmc truck?

Updated: 9/16/2023

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∙ 14y ago

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engine is misfiring badly enough to cause damage to cat. converter causes could be tune up iteams plugs , wires , cap ,rotor, i have found many needing central port injector unit in need of replacement , new improved muti port unit can be installed in its place

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