02 impala 3400 Doesnt like churches?

Hey, my 02 impala 3400 doesnt want to work properly
recently. She start and runs, shifts into reverse smoothly
for the most part, shifts into drive fine, and then when I
get to a stop sign near a church, come down to a stop, let
off the brake and then she stalls out. Googled it, only
seemed like they wanted to tell me that its cause air in my
brake lines or something like that. But it does just fine
during the day. What could this possibly be.