Time isn't a problem. I'm semi-retired, and an insomniac. This site and a couple other things are diversions and I get to help other folks fix cars without getting covered in grease :-)
Oil issue - something like a stuck/broken oil control ring or intake valve stem seal letting excessive oil get into the cylinder. Oil creates black goo and carbon causing the plug to short out.
Black inside intake manifold could be something like a faulty PCV valve dumping oil vapor in. That could also cause the same problem with the plug. Oil doesn't burn very clean.
Thursday, December 15th, 2016 AT 11:28 PM