Ok, I have a 98 ZJ 4.0 4x4 laredo. I have been having some problems with the truck not starting after I drive for awhile. It starts perfectly fine in the morning or if I drive short distances. When I drive for awhile, say 15 miles or so, when I shut it off it doesn't wanna start for about 30-40 minutes. I've been trying to figure it all out but to no avail. I have replaced the crank sensor, cap, rotor, and coil. My plugs and wires are fine, I can hear the fuel pump pressurize and I'm kinda stuck on what else to do. I'm going to replace the pickup ecm today and see if that does anything. If you fellow keepers can help, I'd much appreciate it.