First thing I do when I get one of these old rigs in my shop with odd electrical issues is tighten the harness connectors that have bolts. There's the one at the PCM/ECM, and the one on the drivers side valve cover for the engine harness. These come loose over time and cause all kinds of problems. Next would be to run through all fuses and test relays. Sounds to me like it could be an ignition switch issue or wiring/connections in the column. You wouldn't have a lot of things working if the ignition switch is failing to wake up circuits. I take it you have no communication with a scanner?