Idle drops and stalls after throttle blip

[Da2ss]

Soooo after I let sombody borrow my 01 WS6 went out to find a dead a battery. After getting the car started and Idled for a few, I went for a drive and noticed the idle would dip low and stall after throttle blip or pressing clutch coming to a stop. I didnt notice any voltage drops in the gauge so I am not sure if its battery related or not. The car is completely stock other than cold air intake