Ok guys i have a miss not a bad miss but it happens a few times while driving.I watch my scan master on the right o2 and it reads around 400(moves around that)and then spikes to 999 at a cruz.Also I went through a car wash and the miss was real bad but only on the right side.So my question is Would i be right on it being a plug wire or the plug it self.because if it was the opti it would effect both side on the readings right.

Also is there and easier way to tell wich one it is.

 

change plugs and wires first, see what happanes.