Tony;
Try this. Hook a voltmeter to the output of your oxygen sensor.Do not
break the circuit.  Set on a low scale to read a maximum of 1.5 volts. I
am betting you will see the voltage fluctuate in coincidence with the
RPMs. Why you are seeing it now or if it is a bad thing I do not know.
I have noticed that the O2 sensor output on our 85 GL (digijet FI)
fluctuates much slower than our 86 (digifant FI).
Maybe check air filter, spark plugs, etc.
Good Luck
Ken Lewis
kdlewis@juno.com
86 VW crewcab
85 VW Vanagon GL
60 356 coupe

On Wed, 13 Nov 1996 09:16:56 -0600 "Tony Moore" <tony@moorelab.com>
writes:
>Good morning!
>
>Well, along with the cold weather comes strange behavior from the bus! 
>The
>problem isn't serious at all yet, just curious and would like to 
>prevent
>any problems.
>
>As the subject says, my bus is idling strange, whether warm or cold. 
>It's
>almost like you lightly touch the gas pedal every second or so. The
>rev/idle is very consistent and rhythmic. It doesn't seem to effect 
>the
>drivability at all and doesn't stall when idling for extended periods, 
>say
>10 minutes.
>
>Any advice/comments?
>
>Thanks!
>
>tony
>