spark plug

Hey guys, just finished changing spark plugs on my 2010, got a couple of questions. On the top of this plate (oil baffle plate?), in front of the spark plug closest to the driver's side firewall, there is that threaded hole on top with a nut on the backside. Is something supposed to bolt into...

Hello all - I had an account on here a few years ago but was deployed for some time and I believe the forum deleted my account :frown. Okay now to the problem... BLUF: My FJ has a very rough idle, either in park or drive, but when stopped. Backstory: I replaced my plugs with Denso Iridium's...