My girlfriend has a 96 Eclipse RS. Lately It has been running like shit. At idle it will sputter off and on and sounds like it is going to die. Also, recently it seems to lack a lot of power... can't afford to lose any as it is. When u get on it, it takes a minute to pick up and move. The check engine light has been coming on and off and she took it somewhere and they told her the o2 sensor is dead. Do you tihnk that replacing the 02 sensor would stop all these problems or is it something else? I'm new to mitsubishis. Thanks, JEFF