Hi everybody! First post.

2005 Cherokee 5.7L 123k.

I have an issue where the vehicle when at idle runs rough, hesitates and misfires, or dies when I give it gas. This problem comes and goes, but I notice it mainly when after I have been going slow or in traffic. Also throws some engine codes for o2 sensors. This is periodic and does not occur all the time. I changed all of the plugs and noticed that one plug has oil on it. I have also changed all of the wires, all of the o2 sensors, and the ignition coil for the plug with oil and still the problem occurs. I have attached some pictures of the plug. The one with more oil is the old one that I replaced. Any ideas?




old plug



new one after two months