Oh great, another annoying vacuum problem thread! I've been searching for a while now with no success, so I will explain wtf is going on. Idle shakes pretty hard, probably gonna kill my new motor mounts. Hooked my vacuum system right at the main line to my boost gauge so I could see how the vac system is working.
System leaks down pretty quick, like just under a minute. System never builds up past 10 in/hg.
One of the AC pods was leaking, I plugged the line. Other pods hold strong vacuum over lunch.
Door locks also work consistently even when parked over the weekend.
Reading it might be the check valve, I took it off. The o-ring was shot, replaced previously by former owner. The valve itself was intact, spring, plastic and all. There was some motor oil in it though.
I bypassed most of the lines under the hood. EGR deleted long ago, also got rid of the loop. Vacuum dampener is hooked up, new fittings for a tight seal.
I'm not 100% but I'm guessing the presence of MOTOR OIL inside the main check valve is a hint of the issue. What I don't know though is what is inside the pump that would need to be resealed? I know the older versions had a diaphragm where the newer style uses some sort of cam.
I'm sure I have a leak somewhere else (maybe a missed fitting or something).
Help?

Update 1/28/17
New rack dampener bolt, not 100% sure if I needed it, new one was stiffer than the old, but not collapsed. No change

Adjusted valves .15mm intake .35mm exhaust. No change noticed, 6 of 10 valves tight, 2 loose, 2 perfect.

Vacuum pump by itself takes over a minute to get to 10 in/hg vacuum. Leak test performed at dampener, the two little green things, and modulator, all passed. Door lock system passed, HVAC small leak, very slow. Seem to have no line for a reservoir, maybe removed by previous owner? Didn't test shutoff (works great) or vacuum control valve (I read it's supposed to bleed off into cab). Rest of system deleted.

Update 2/1/17
America is still here, Donald Trump hasn't blown it up and most of us are living our normal lives.
New vacuum pump confirmed to be working properly, pumping a nice strong 23 in/hg.