Rough idle/stalling issue 95 mercury sable 3.0l

So I finally got old Bessy somewhat
running again.  A long time ago
(~3months ago) my car would only
crank and not turn over, turns out it
was the distributor so I went ahead
and replaced it along with the
cap/rotor/wires/spark plugs/coil pack
cause it all looked pretty beat up... I
did get the timing right with the new
dizzy, that's all figured out.  She now
starts but runs VERY rough in
park/gear and tries to stall a good bit
but most of the time catches herself
right before she's about (in
park/neutral only.  In drive/reverse
when she sounds like she's about to
die the rpm drops and she just flat
out cuts off half the time but starts
right back up, really no issues driving
other than a bit loss of power...  She
spat out two codes at me 122 and
211 so I'm not sure where to go from
here.  She does backfire a bit too.  
When I first start her up cold she
runs like a dream for about
40seconds until she gets warm then
all the issues happen.  Help is much
appreciate and I'll provide more info
to any questions anyone might have.