Mystery hose ID needed.

[Dr.Decapod]

Hello Everyone,

I am putting a 2008 Aveo back together and this hose is left over and for the life of me I can't figure out what it came from.

When I got this car it was already apart and the hose was with the removed parts.

The timing belt was the original job they were doing if that helps.

Thanks.

[Eg.h2o]

Emissions hose? Vacuum hose? Coolant hose?

[Dr.Decapod]

Emissions hose? Vacuum hose? Coolant hose?

No idea, seems to have not had fluid running through it as it just has dust inside. It is about 1/2 Inch inside diameter and also has no clamp marks I can discern.

[Eg.h2o]

Maybe the pcv/valve cover hose?

[Dr.Decapod]

Where? I can't find one missing. It's all back together save this hose and it is running rich at idle now. It's driving me crazy. Anyone have a hose diagram for it?