Pulled these plugs out of my TransAm today. The plug on the left was pulled out of the passenger side. All 4 plugs looked like that one. The plug on the right was pulled out of the driver side. All 4 plugs looked the same. I'm thinking yellow electrode and bright white ceramic are not good. I'm thinking my o2 sensor is whacked out but isn't throwing a code. There is no other sensor in the car that could have such an effect on only 1 bank of cylinders. Sound reasonable?