Yes, Yes... I Love threads about Jeep Cherokees. Just LOVE Em! I currently have 6 XJs, four of which have the 4.0, my 87 with the AW4 auto with original everything that has 293,3?? miles, my 96 with the AX-15 5 speed that I just rebuilt and put a new clutch in front of that drives but shifts hard due to a worn out and leaking Master/Slave cylinder combo that has 248,7?? miles, my 99 2 wheel drive whose 4.0 I reBuilt(Heavily ported cylinder head, .020 milled, 6 New Sealed Power pistons, Hastings Cast rings) this summer with 140,8?? miles with the AW4 auto 2 wheel drive version(Fast Jeep), and my Beloved SilverStone Metallic 2001 with 64,6?? miles that runs and drives sooo smooth. My Favorite spark plugs are Plain Jane AutoLites(925 I believe). I have used Champion Truck plugs with good luck, my friend didnt have so good luck with those in his 88 XJ. I have used Champion Platinum, Factory Champion, AutoLite Iridium, and AutoLite Platinum plugs All with Good Luck and performance. But I am partial to the Orange box Autolite plugs, just because I believe Jeeps dont like to be pampered with to much High Zoot componentry. Your 2000 will have Coil-On-Plug, which makes it a bit more time consuming to change plugs, not to mention you can damage the coil pack if it gets smacked around or dropped, so I would recommend those Champion Truck plugs as well or AutoLite Iridiums for longer service life and less frequent change. I like to stay away from Japanese plugs for my American made Jeeps. Japanese just dosent seem right in a Bad A$$ American vehicle, though the transmissions, regardless of Auto or Manual are Japanese...Except for the 87-89 XJs with the Peugot BA10/5 5 speed, and the ULTRA rare 2000 and 2001 XJs with manual tranns that have NV3550 5 speeds...Ive only seen two of these in 6 years of searching.