When I turn the ingition switch off the engine doesn't shut off immediately and when it does the lights on the dash oil gen ect dim slowly before going out. Back feed It is a 1991 Pontiac Sunbird?

The issue you're experiencing with your 1991 Pontiac Sunbird could be related to a faulty ignition switch or a problem with the electrical system, such as a failing alternator or a weak battery. When the ignition is turned off, residual power may be causing the engine to continue running for a moment. The slow dimming of the dashboard lights suggests that electrical components are discharging gradually, which could indicate a short circuit or poor ground connection. It's advisable to have the ignition system and electrical components inspected to pinpoint the exact cause.