Sorry to bring this back to life but i never did anything about it and plan on doing a cct while im in there doing my valve cover gasket. What i meant in earlier posts about it not being so consistent is its like a tap tap tap pause tap tap tap pause tap tap tap sound as opposed to an all the time rubbing chain noise as i saw in other failing cct aeb videos. So I thought it might be a lifter or a valve stem since my idle isnt as stable as it should be.