1990 Olds Delta 88 Check Engine Light?

I have a 1990 Olds Delta 88 with a 3800 V6 engine, the service engine soon light has been on for a while, ran a diagnostics, was code 23, i replaced the sensor which was the manifold air temp sensor, changed sensor no problem, reset the computer, still no change, light is still on, and i have no idea how to fix it, any have any ideas?