And

Am going through the process of dismantling / cleaning and looking for leaks in my intake and figure I have just about all the vacuum lines / vents figured out... except...

I count 3 hoses to the oil tank -

1) crank case vent hose (supported by the intake boot but no connection to the intake)
2) oil tank vent line (smaller hose than the other two, connects to the left side of the throttle body)
3) ??? (another large hose connected to the top of the intake boot)

Anybody know what that 3rd hose is for??

Also, any other common intake leak points I should check??

andrew
1990 C4 Targa