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That's pretty close for a 87-92 4-cyl or 87-89 V6. Video looks like a 87-89 V6 pickup. What year and engine are we talking about?

Sounds like you have a broken exhaust stud or two...
 

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You are correct; at idle you should have 34 psi with the pressure regulator vacuum hose connected, 43 psi with it disconnected.
 
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