Why does your 1991 oldsmobil cutlass ciera stall when you hit the breaks?

Your 1991 Oldsmobile Cutlass Ciera may stall when you hit the brakes due to a vacuum leak in the brake booster, which can affect engine performance. Additionally, it could be related to a failing idle air control valve or fuel system issues, such as a clogged fuel filter or a weak fuel pump. Checking for any error codes and inspecting these components can help diagnose the problem. Finally, ensure that the battery and alternator are functioning properly, as electrical issues can also lead to stalling.