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Re: P0171,P0174 could use some direction
Posted to Technical Discussion Forum on 12/4/2023 1 Reply

It definitely sounds like a vacuum leak, given that the trims are normal when you hold it off idle. I have never seen the crankcase cause this, but it could be a possibility. I would disconnect the purge valve and plug that port as someone else suggested, also... Login to read more.

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