Today I attempted to install new spark plugs without removing my intake plenum. I installed 5 of the 6 plugs successfully and left the middle one on the passenger side for last (directly underneath a plenum duct). The plug got stuck to the spark plug socket and both together are too long to clear the plenum on extraction. I tryed using an extension to draw it out but it just comes undone and will now have to remove the plenum anyways. My advice, dont use the spark plug socket. Find another way to get it out once its loose.