It's NOT Vanagon Syndrome. With Vanagon Syndrome, it ECU will reset, start and run fine for a period. See the factory tech bulletin in the first post in this topic that describes the symptoms. You have other FI problems covered by the other topics in this forum. Have you done any diagnostics per the Bentley or those topics?
I have a 1991 Vanagon GL full camper with AT and about 155,000 miles. I've only had the van a few weeks and it has ran flawlessly - until yesterday. I recently went on a 900 mile road trip and returned home with no problems. When I went to start the van the next day it turned over, started, and idled very roughly and sporatically (400-2000 rpm) then it died. I tried starting it a few times with the same result. Sometimes it would start and sound ok - but then when I put it into gear it would die. I've read the posts on the Vanagon syndrom and I installed the replacement harness, but the same problem still exists. Any suggestions?