Do I have low vacuum?

[Mebsuta]

Noticed my secondaries don't seem to be opening. I have whatever springs come out of the box. Should i change them? Can this be related to my vacuum issue? I checked to make sure my throttle cable was set up correctly and it is.

You can check. Put paper clip on shaft that connects secondary throttle to vacuum diaphram. Go for drive. If clip has changed position, will indicate if and how far secondaries have opened.

I believe secondaries will open at low manifold vacuum in vacuum-secondary carb; ie when you are at wide-open-throttle under load.

http://www.holley.com/TechService/FAQ.asp