I recently did a 5.4 swap with a new MMR 5.4 shortblock. I was running a TFS intake but removed it because of fitment issues. I had the top of the intake off and noticed oil in the bottom. I thought perhaps it was in there before (i bought it used) and didn't notice it. Well today I looked in my new PI intake after having run the car for about 20 minutes total over the period of a couple weeks and noticed I have oil in there again. The engine has PI heads with a valve job, and CMS stage 2.5 cams. I don't have the PCV hooked up and the usual other vac lines hooked up like brake booster, fuel pressure regulator, and the one for the fuel vapor canister deal. Any ideas?