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International Automotive Technicians Network
Re: p0300 misfires
Posted to Technical Discussion Forum on 2/13/2021

Mario,

Do you know if the machine shop replaced the valve guides ? Not the seals, the actual guides. Just about every single one of the Ecotec heads I have worked on has needed valve guides if they had much more than 70K miles on them. Most of the ones I hav... Login to read more.