Sorry, but if it's an STX, it's either a 94, a 95, or a 96 as those were the only years they made them. As far as the spark, you'll need to pull them out of the engine, plug them back into the wires, and set them on the head making sure they make contact with bare metal. Then pull the engine over and you should see a nice blue spark on both plugs. A compression test would be handy because if your compression is low, you'll never get it to start.
By the way, welcome to the forums.