Ok so i have been having a idle problem. It would just shake. So i have changed everything, wires,spark plugs, cap, rotor, fuel filter, iac, tps, cleaned throttle body. I hooked it to a scanner and is was showing the upper exhasut going from lean to rich to center. My question is, is that telling me that the o2 sensor can be going bad because of the flux and would that cause a shake at idle.