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1996 3.1L Plenum (Upper Intake Manifold) vacuum hose
I asked this in another thread, but realized the exposure would be better if it had it's own thread.
On my 1996 Lumina, 3.1L, there is a hose coming from the plenum (upper intake manifold). It is located on the side closer to the firewall, on the passenger side of the engine. It is a vacuum hose, about 1/8" outside diameter (OD). It wraps around the firewall side of the engine, by the coils, comes over the throttle assembly, and dives toward the inner fender. It is at that point that it is disconnected. Can anyone tell me where this goes and what it provides the engine? I understand that it affects the fuel/air mixture somehow, as when I remove the hose completely, the idle suffers badly.
Thanks.
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