Ok. Thanks for the answer. What else may be the cause since the code(s) that the computer returned was interpreted by the automotive guys at O'Reillys to be, and this is their words, "the inflow O2 sensor". I have already replaced the throttle body, catalytic converter (which did need changing), the mass air flow sensor, and replaced both spark plugs and wires (about 4 months ago).
Monday, December 13th, 2010 AT 9:36 PM