Went on a drive today.. drove about 2 hours and while going up a hill I lost power.  The engine was running, but I had no response when I stepped on the gas.  I thought I broke the Throttle cable, but after a quick inspection I found that it wasn't the case.  After about 5 min I tried it again and everything was back to normal..  I drove over 150 miles back home with no problems..  Is this the "Vanagon Syndrome"?

any insight would be appreciated.. 

Thanks
Shannon 
91 Vanagon