My CEL came on yesterday after running the deep creep treatment through a vacuum hose.. and I pulled the misfiring on cyl. 6 code after that. It was definitely caused by the deep creep (by seafoam)..

Does anybody have a suggested course of action? I don't even know where to begin..

Thanks,
Zach

 

Pull the spark plug. Take a look. You may have deposit or chunk on the plug dislodged from the treatment?

 

Ok cool I'll give it a shot.