Try putting oil around the intake manifold where it meets the head. If it gets sucked in, replace the gasket. I had a 69 Camaro that happened to. It had no get up and go but was like a work horse after I replaced the gasket. My neighbor gave that little trick to me. He took the oil can, squirted some oil on it, low and behold the oil disappeared in a couple of places. Vacuum leak found!
Participate in life....Keep movin'....Go there....JK'n it.........Do it! Jeep #1: Red Rock 08 JK Rubicon 4dr, 6 sp manual, Stock Mud Tires, MyGIG Upgrade, Hard Top, after sale BestTop SunRider Soft Top, Congo Cage Rack, Mopar slush mats Jeep #2 Black 08 JK Rubicon 2dr, 6 sp manual, both tops, some chrome...uggg (my wife's jeep) Jeep #3 White 92 YJ (my son's jeep) A great quote from a good friend: "All hail click clack and master jk'n." Click and clack are my idols!