L67 Vacuum under throttle body

[CookedVy]

Hey guys, a little while ago I put a l67 into my vy Ute. All is going well but it seems to have a lump on idle like theres a vacuum leak somewhere. I noticed under the throttle body there was a vacuum hose that was open. So I blocked it up with a screw and the idle went smooth. But when I went to take off the car just died out. When I unblocked it the lumpy idle came back and was fine to drive. Doesn’t really affect how it drives when it’s unblocked just gives it a lumpy idle. Anyone know why? Is it alright to leave it unblocked?

 

[Immortality]

Nope.

The small vacuum line goes to the purge valve on the back of the drivers side head.

 

[krusing]

There is a number of Vac lines on a L67, and could be any one them,
Could be either a broken fitting, or perished vac hose.
I found the plastic to the right-hand rubber connectors split on my L67,
Replaced them with rubber vac hose.

Best to get it smoke Tested, as that will locate the Vac leak/s.