Removed the intake manifold on my 617.952 and found all the intake passges clogged with a carbon goo with a similar consistency to chewing gum. Not being a diesel mechanic I have never encountered something like this before. Is there any sort of home remedy that can clean this out? I can think of things like a hot tank on a professional level, but I don't know what approach would work at home. I have never seen anything like it.