Per Zoltan's suggestion, I spent some time on the air intake system.I replaced the Fuel Injector seals.Checked the Breather Hose.Checked the Idle Stabilizer Hose.Removed the big hose between the Throttle Body and the Mass Airflow Sensor.Checked the torque of the Induction Tubes at the Heads. (New Gaskets last year).Checked the clamps at the Induction Hoses at the Air Box. (New Hoses last year).Replaced the Vacuum Hose at the Fuel Pressure Regulator.
I seem to have fixed the vacuum leak because my Fuel Pressure Gauge reads as follows:
Key ON, Engine not running: 36 psi
Key ON, Engine at idle: 32 psi
Key ON, Engine at 1500 RPM: 30 psi
The engine starts a little bit easier, but it still seems overly rich on start up: a little black smoke on start up which clears in a couple of seconds.
I haven't tried adjusting the MAF with the 5 mm allen wrench, but I have read the procedure from the Samba.
I want to be sure I've covered all the basics before I launch off on that path.
To all my vanagon friends: Thank you for your suggestions. I've acted on every one of your helpful insights. I'm making progress.
What next?
Kind regards,Mike M 

    On Friday, November 18, 2016 11:28 PM, David Beierl <dbeierl@ATTGLOBAL.NET> wrote:
 

 At 20:42 11/18/2016, OlRivrRat wrote:
>n 18 Nov , 2016, at 4:55 AM, David Beierl wrote:
>
> > even if engine vacuum changed 1:1
>
>        1:1 What ?

Even if engine vacuum was reduced by an inch of mercury for every
inich of mercury decrease in ambient pressure.

Yrs,
d