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2006 Sierra 5.3 Missing

gm4me

By gm4me
in Ask A GM Technician

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gm4me New Member

gm4me

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I have a 2006 Sierra 1500 5.3 and it sounds like it is missing when the accelerator pedal is pressed more than half way or when it downshifts. The check engine light is not on. The problem is the same whether I am pulling my boat or just driving back and forth to work. I have changed the plugs and tried some lucas fuel cleaner and dont really want to start throwing parts at it if I dont know what the problem is.

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