I have been having a problem recently with the engine dying when the car decelerates suddenly when coming to a stop (or even decel'ing to turn a corner). I recently replaced the air filter per a friend's suggestion. However, when I purchased the air filter from a local Volvo dealer, the parts guy mentioned a potential problem with the AT not downshifting properly when the vehicle decelerates, thereby causing the engine to stall. Any ideas on what to look for, i.e., simple or complex fix? I have a Bentley manual but have not even tried to diagnose using that reference yet.