I have seem many times of people posting about P0018 and its relation to the timing chain guide needing replaced. But havent found any forums talking about P0019 and its relation to anything in particular. Am I right to assume this code along with P054b is related to the timing chain guide? I noticed I am getting a lot of misfire codes as well. Could this be an injector problem, etc, or is it normal to get these misfire codes when the timing chain guide is going?