Update to my problem. I failed to mention in my original post that about a week or 2 before I started having this problem I was sitting in a friends driveway & my jeep started to overheat. Turned the vehicle off immediately. Sat for about 45 min. talking with my friend then, left & drove home about 30 miles. No signs of overheating again. Ran good for the next 1 - 1 1/5 weeks. Anyways. I swapped the ignition coil from cyl. #8 with cyl. #3 & still the same problem. I bought this jeep with 31,000 miles on it & I know have 118,000 miles on it. I never have changed the plugs since I bought it. So I figured that I would change all the plugs, maybe the #8 cyl. plug was bad. Still same problem. While jeep was running started pulling each ignition coil plug to see if there was a difference in the motor sound. Motor sound changed on all except cyl. #8. So I decided to do a compression test. Cyl. #'s 1, 2, 3, 4, 5 & 7 ranged between 150-152. Cyl. #'s 6 & 8 were at 120. Right now I am in the process of removing everything to be able to remove the heads. I plan on taking the heads in to check for warpage & to have a valve job done on both heads. Right now I am at the point where I need to remove the fuel line from the fuel rail. The service manual states that I need a Snap-On tool #FIH-9055-1 or equivalent. Can I get this at Autozone, Advanced Auto Parts or Oreilly's? Any tips or videos anyone can point out to me?