I have been reading the archives trying to find a fix my problem
on a 85 vanagon 1.9 which started about a month ago.  About
60 miles from town the van started surging and progressively
got worse.  I turned around and had to go up mountains with 
about 4,000 foot vertical--I eventually downshifted to 2nd
and crawled at 20-30 mph.  Once the engine cools the problem
disappears until it warms up--ie.2-3 miles or 5-10 minutes.

This has been my problem solving so far.

1.  AFM is about 4 months old--rebuild bosch.
2.  O2 sensor is about 4 months old.
3.  Replaced Temp Sensor II--no affect on problem
4.  Looked at catalytic converter today--it is OK.
5.  Went to Bentley's and did the multimeter checks, for 
    the fuel injection system, Section 24, I think,
    things looked OK, but on the ECU plug the ohms for
    the temp sensor I was extremely low, although at 
    pin 2 and 4 on the sensor itself, the ohms were 
    within limits.
6.  I also installed the "magic harness" which did not 
    solve the problem.

I would love to find the "magic bullet" to solve the problem.

Can anyone give me any advice?

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