Where dose this vac line go?
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
The "Modulator" screws into the back of the tranny. Sometimes they fail and allow ATF to be sucked into the Intake manifold via that steel / rubber line shown in your photo. When that ATF burns out of the tailpipe, you will swear the car is burning oil.
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Le Mans Master
Joined: Jun 2019
Posts: 5,485
Likes: 2,193
From: Loveland
Is the distributor vacuum hooked to full manifold vacuum or ported vacuum? I changed mine from ported to full vacuum, and retimed the distributor. It made a lot of difference. What engine do yo have?