I have a 90 Vanagon Multivan  2.1L just returned from camping a week ago
and the van ran fine except I did start to notice some hesitation/surging
whenever I need to give it some extra gas, like during acceleration or going
up hill.  No problem starting, in fact when the engine is cold it seems to
accelerate without hesitation so I think I may have a problem when I need
fuel enrichment.  The idle is a little rough too, but not real noticeable.

Just wondering if anyone has any ideas where to start troubleshooting this
problem.  Just put new plugs in a week ago and did an oil change.  New heads
and gaskets about 10 monthes ago.  Van has 87,000 miles and the fuel
injection system has never been serviced to my knowledge.  I pretty much am
thinking I'll just check components out as outlined in Bentley and work
through it.  O2 sensor is also original.  Van does cruise at 70mph without a
problem.

Any ideas would be appreciated.

TIA,

Tim Marciniak
Muskego, WI