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Re: 2009 GMC sierra #7 cylinder issue
Posted to Technical Discussion Forum on 1/10/2019 2 Replies

We fought those issues for years when engines were under warranty. It's going to at least need a piston re-ringing. Decarbon procedure didn't help the engines I've seen. You have covered all the bases we would have done. Like some have said, may be better off ... Login to read more.

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