I have a 93SSEi myself, and have experienced Service Engine Soon light warnings:
Start with a tune up. The car might be trying to tell you something.
Use AC Delco plugs, and a good set of ignition wires. STAY AWAY FROM BOSCH!
Our cars don't like Bosch.
Change your oil, who knows when it was done last!
Another thing ( I know this sounds weird, but it is true! )
If I don't put my gas cap on tightly, it will throw the light. Make sure you hear at least 3 clicks, it actually tells you inside the gas door and cap too.
Oh, always run premium unleaded. The car will thank you for it.
Can't wait to see it, remember: Post some pics in Your Ride!
2006 Pontiac G6, 2.4L Ecotec
1993 SSEi "Bonnesaurus" sold regretfully 10-27-10