[Stang_ROTY]

My Uncle has a '96 Cobra that is bone-stock. The check engine light comes on, then goes off, then will stays on, goes off etc. But it doesn't blink. We changed the plugs and the light went off for a while, then came back on. He even had the Computer reset this morning. But by the afternoon the light was back on. The mlies are 48K. I think it might me the O2 sensors...am I close? Also, how many o2 sensors are on the car with the stock (Yes, restrictive 4-cats) exhaust system? thanks in advance!