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1986 GMC Sierra you had a smog and they said the vacuum lines were modified well whats the correct way to have them?
Wiki User
∙ 14y ago
The best way to find out is to buy a service manual that gives you the vacuum and wiring diagrams. Or look at the emmissions label underneath the hood which should be on the fan shroud or on the hood itself if its still there or readable
Wiki User
∙ 14y ago
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