Sumbling Idle

["Alexander van Gerbig" <Audi_80@email.msn.com>]

    I have a stumbling idle at hard decelleration.  It hits idle and the
engine surges once or twice then evens out.  I have checked the fuel
shut-off and it works properly.  The DPR is running a normal current when
the OXS is running.  When the OXS isn't warmed up I see a very low current
running to the DPR.  I would assume this means the mixture is too low,
regularly in a new engine the current should run around 2mA, mine runs at
0.8mA when OXS not active(cold engine or disconnected).  This stumbling at
idle could be a low mixture then the OXS picking the slack up.  I just had
the mixture checked about two months ago and had it set to 1.2%.  DPR
surrent ran 2.2mA, which is perfect.  Why would my mixture setting keep
changing?  There is no lean mixture code.  I have had the mixture tuned at
least 7 times over a two year period, this seems a little strange.

Thanks!

    Alexander van Gerbig '88 80

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