A long time ago my BA, when slowing down to a set of lights, the revs would drop and sometimes stall.. Is yours tuned? cause it hap end to me not long after it got tuned, but it sort of went away by itself, changed tuners and never had the problem again.. When I was askin what was wrong I was told it could have been the TPS(throttle position sensor), dirty throttle body, can't remember what else though..