funky idle

[Brandon Rogers]

Hi All-
It seems to me the idle on my car-'98 A4 1.8T w/ chip- has changed.  It
seems to fluctuate ever so slightly when i sit at the light.  That does not
bother me, and may have been like that all along, but I don't remember it
like that.  What bothers me is that if i blip the throttle it then drops
down to the mark below 1000, becomes rough (barely) catches itself, and goes
back to normal idle.  Or if I'm just sitting still with the motor idling and
I crank the steering wheel all the way to one side, the idle dips - the same
as if blipping the throttle.  Any ideas?  My first thought is maybe a
cracked vacuum hose. ??  TIA.

Brandon
'98 A4
'84 Urquattro