Originally Posted by 74_jeep
I done mine on a 5.2 , I did not have the loud sound as you decribe . But did have the oil on the bottom of intake.
About doing the plenum gasket , all I can say is , it is time consumeing . A lot of stuff to remove to get to it .
Another thought , maybe check to see if the EGR valve is sticking /
intake and throttle body are COVERED in oil residue. could maybe be from over oiling the kn filter, but its pretty black in there. this truck is non egr. im kinda curious as to which years are. i have owned several of these engines in various vehicles and years, but never seen egr. even have a set of headers for magnum engine w egr. the pcv valves were however pretty hosed, but i dont think thats nearly enough pressure to cause this. will be replacing those asap.