Yep. Your CCV hoses and/or fittings are clogged. The biggest problem is with the one from the rear of the valve cover to the intake manifold. Make sure those is clear by removing it completely and blowing through it. Look at the intake manifold fitting and make sure it's not alll carboned up.
Here's something else to do afterwards if you feel so inclined. It's a suggestion from the factory that was never published in a TSB to my knowledge.
Cruiser’s Valve Cover Mod
Most early and even later Renix 4.0s could be bothered by excessive oil in the air cleaner box. A fix from my old days as Service Manager at a Jeep dealership follows. Information was provided to me from a buddy at JeepTech during those days. I don’t believe it ever came out in a Technical Service Bulletin.
Remove the valve cover and turn it over. Next, remove the fluted tubes that are now facing you by removing three screws on each. Chop 1 inch off each of them. Then, about a half inch up from the area where you just sawed them off, drill a half inch hole in the tubes so the holes will face the rear of the valve cover. Clean and de-burr/sand all rough edges nicely, clean with solvent, and reinstall. Don’t be concerned about the chintzy gaskets that will probably crumble into oblivion when you remove the fluted tubes. They can go back together without gaskets.