OK, so what you're saying is that it's running rough, but not that it keeps running after turning off the ignition, right? Has it just recently started doing this, or has it always done it since you've had it? If it just started doing it, think about what you may have done to the truck just before the symptoms started. For example, did you just put gas in it? You may have gotten a bad tank of gas. Did you just change the plugs? They may not be gapped properly. Did you just change the plug wires? Make sure they are all going to the correct cylinder. Is the Check Engine light on when it runs rough? If it is, see if you can pull the codes off of it. Start with the basics first: check the plugs, wires, air, oil, and fuel filters, clean the throttle body, pull the negative battery cable and reset the computer, and try a carbon flush. If everything looks alright, then start checking things like timing chains and injectors. I do agree with 2001ExpSport though, if it was hit hard in the front, the timing chain is a very good possibility. Especially if that's when the symptoms started.
peace
Mike
[Edited by Mike 92 XLT on 07-25-2000 at 02:35 PM]