If it's a 1993, then it should have an M104. If it does, then it won't have distributor cap or distributor. Rather, it is probably one of the three coil packs. As Dean said, connecting a tester to the 16-pin test connector and doing a blink-code test will tell you which one. If the O2 sensor is bad, likely it would trip a check-engine light.

If it is a coil pack, it's a 30-minute job to change out. Best prices are on Bosch units at auto haus az dot com.