Sounds to me like your throttle position switche(s) need adjustment.
The procedure for adjusting it (or them) are in the Bentley and I'm sure
in the archives and/or on the Samba.com.  If you don't have a Bentley
Shop manual for the Vanagon you should get one as it will prove to be
invaluable.  Try searching TPS (throttle position switch) in both places
and you will get lots of information.  I believe early '84 have two
switches (like mine) and later '84 have only one switch.  Mine did the
exact same thing you described after rebuilding my motor because my the
switches that were out of adjustment.  I also have the dijijet fuel
injection manual that has the adjustment procedure in more detail than
the Bentley.  Pmail me if you cannot find the information in the
archives.

Pascal
'84 Westy
-----Original Message-----

"So this is the problem, when a step on the gas pedal just a little. The
motor revs up and down.  When idling it runs fairly smooth but sometimes
it
does this also when idling.  Otherwise the motor seems to run fine"

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