Why won't my 1992 Cadillac El Dorado down shift?

There could be several reasons why your 1992 Cadillac El Dorado won't downshift. Common issues include a malfunctioning throttle position sensor, low Transmission Fluid levels, or a faulty transmission control module. Additionally, problems with the vacuum lines or the governor could affect shifting. It's advisable to have a professional diagnose the issue to pinpoint the exact cause.