So im getting code p0203. misfire I've been searching and have not seen anyone post what they did to fix it. I have seen a lot of posts of people asking. But a lot were never finished. Anyone have any idea I seen that I believe wj had a problem with the wire rubbing the back if the head any help would be appreciated.

Also weird part is I only notice it misfiring in reverse. Drive and neutral seem ok but reverse is also geared lower than most

 

Check the plug harness on injector 3.