Actually, simply stating that you have a 4.0 doesn't tell me anything useful other than the fact that it is an internal combustion engine with 242 cubic inches of displacement. Anyone can throw out a suggestion like "check your plugs" or "clean your air filter" and that may help to solve the problem. However, knowing things like whether or not it is an auto or manual could help determine if the problem might be related to something like a neutral safety switch or clutch position switch. Knowing what year the vehicle is could help determine if it has a typical distributor and wires set up or if it uses the ignition rail (like the 2001 that he has vs. a 1997 with wires and a dist. cap). Also, when a new user signs up, doesn't fill out any details on his profile and his first post is as general as this was, it really doesn't show that he has done any research on his own before just creating a user account waving the help flag. Lastly, I wasn't trying to be a jerk, I am trying to help the guy out. Not so much as in direct relation to his engine problem, but more in the realm of how he could go about earning a little respect from some of the more engine savvy guys that could help him. Those two stickies were put up by moderators for a reason. My apologies to the OP if I offended you. Best of luck with your repair.