Vacuum Issue

[somebourbon]

So, I was using my trusty FSM to troubleshoot my EGR and a couple weeks ago found that the BVSV was bad. So, I bypassed it. I ran a hose from the modulator straight to the EGR valve.

Today I finally bought a vacuum gauge and wanted to make sure everything was good before I kicked down $50 for a damn smog test. When I hook it up to the modulator and rev the engine up to 3000 -3500 rpm, it registers around 20". Now when I splice into the line, I get like 5". I unplugged the hose from the EGR and capped it with my finger and it read 20". I was thinking maybe the EGR valve diaphram is ruptured. I ran a vac hose to the EGR valve and it killed the engine.

So my question is why is it that when the gauge is hooked to the modulator I read vac, but when I hook the same hose up to the EGR and splice into it, I read nearly nothing? The FSM says that I should read vac at RPM spec. Remember, I have the BVSV bypassed. Thanks