1. Vacuum Leak: Inspect the vacuum hoses connected to the carburetor, brake booster, and other engine components. A worn-out or disconnected hose can cause a vacuum leak, leading to insufficient air/fuel mixture and stalling.
2. Brake Booster Issues: A faulty brake booster can cause excessive vacuum draw, pulling too much air into the engine and making it run lean. This can result in engine stalling, especially under load or when the brakes are applied.
3. Fuel Delivery Problems: Check the fuel filter for clogs, and ensure fuel lines are clear and not pinched. A malfunctioning fuel pump or a faulty carburetor can also lead to fuel starvation, causing the engine to stall.
4. Idle Speed Settings: Inspect and adjust the idle speed screw on the carburetor to ensure it's set correctly. An excessively low idle speed can cause the engine to stall, especially when additional loads, like brakes, are applied.
5. Ignition System Issues: Check spark plugs, wires, distributor cap, and ignition coil. Weak spark or misfires can cause the engine to stall, especially under load or when the brakes are applied.
6. Faulty Sensors or Valves: Components such as the idle air control valve (IAC) or oxygen sensor can contribute to stalling issues if malfunctioning.
7. Mechanical Issues: In rare cases, internal engine problems like worn-out piston rings or other mechanical failures can also cause the engine to stall.
Note: If you're unsure how to safely and correctly inspect or adjust these components, it's best to seek assistance from a qualified mechanic to avoid any potential risks.
