1990 Ford Bronco II dies when put in any gear Is Fine in park?

If your 1990 Ford Bronco II dies when put into gear but runs fine in park, it could indicate a problem with the transmission, a vacuum leak, or an issue with the idle air control valve. Another possibility is a malfunctioning torque converter or an engine that isn’t producing enough power to handle the load when in gear. It's advisable to check for any trouble codes, inspect the Transmission Fluid level and condition, and ensure the engine is running smoothly overall. A mechanic can provide a more detailed diagnosis.