Vacuum Help
 

I have a 81 300d the vacuum system drops from 15hg to 0hg immediately when I apply throttle.This model does not have a bowden cable or pressure rod.The way I understand the vacuum system the vacuum should drop according to throttle position.Any help would be appreciated.

Do you have a 3/2 valve on the top of the valve cover?

Where are you measuring the vacuum?

Helo, yes i have three of the 3/2 valves on the valve cover.I was testing the vacuum at the last T where the transmission line connects after the 3/2"s should have done there thing.The vacuum did not stay even it bounced around a bit at idle but droped fast and smooth as soon as throttle was applied.

One more question are we reading vacuum in hg. in. or hg. cm?