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Old 01-06-2012, 10:35 PM   #25
TrueChevyTech
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Join Date: Jul 2009
Location: Sioux City, Iowa
Posts: 48
Re: Same problem new motor..

Yes the egr has a N, so negative back pressure it is. The numbers on the valve are "dcw 17087198 086 71N" it is 87 half ton 2wd , factory 305, previous owner did a 350 swap, it ran great for 4 years for me then after sitting a couple months it started stumbling slightly above idle. Moving or parked.
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