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Re: 2002 Yukon XL P0174, P0171
Posted to Technical Discussion Forum on 1/26/2006 1 Reply

I hate to keep digging but...

Can I see a graph of desired idle speed, actual idle speed, timing advance and IAC at idle?

While I'm waiting I'd probably do a quick underhood visual. Is the PCV system intact? Is there an "excessive" negative pressure on the... Login to read more.

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