What is your idle RPM? Tuners walk a fine line trying to get the idle perfect and sometimes forget to take into account the AC drag, although the heater shouldn't put a drag on the car unless you're running it in AC mode. It may just need a little more idle speed or tweaking of the IAC.
Next time you're in it, start the car up normally without the heater/ac on. Increase the RPM's just slightly and then turn the AC on.
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2010 Black 2SS/RS A6
Halltech CF 102 fed
GPI modded intake manifold
Bo (knows) White ported TB
Kooks LT's/ Dynomax VT
Pfadted (springs/sways)
Dyno tuned by Rhino and GPI
I once parallel parked a train.
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