Thanks to all who reached out. We are still out of service. 
We made it to a hotel in Rocky Mount North Carolina. 
I called Peter at Van Cafe. He was incredibly helpfully. He walked me through checking the OX sensor, OX sensor ground, fuel pressure regulator and a couple other most likely culprits. No luck, so he is going to overnight OX sensor, Computer, Mass Airflow meter, tune up kit, fuel injector temp sensor and a couple other items to my hotel. 

I'm to install the items one at a time and hope we nail it. 

He'll only charge me for the items I install. How nice is that?

Sent from my iPhone

> On Mar 17, 2014, at 5:02 PM, Kk Al <kkalnsf@gmail.com> wrote:
> 
> Hello all
> We are in the middle of our vacation traveling in our 87 Synco. The van has been running very well untill all of a sudden it started missing on the freeway. We pulled over and did a visual inspection. Everything looks ok. I pulled the plugs and found theky are all fouled. 
> Once we started bwck up everything worked for a few minutes and the missing started again. 
> We have noticed the problem goes away if we keep the accelorator on the floor . If also goes away for a few seconds  if we let off the accelorator and reapply 
> The problem arises when we how the accelorator steady.
> 
> Any help is appreciated. I'll be checking email frequenly