Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome to just answer and allowing me to assist you. As far as oil on the spark plugs, if it's on the top part it won't cause any noises usually unless it's shorting out causing a misfire. just replace the gaskets and grommets. if it is leaking oil on the electrode that's another story. The cam sensor should be replaced as it controls valve rimming through the vvt drums . hope this gives you an idea where to start and if you require further assistance I'll be happy to do so.