My 2000 3.0L 4x4 has severe driveability issues. It started about month ago. The engine starts to stumble and misfire and is barely driveable. I found if I disconnect the negative battery cable, the computer resets itself and the vehicle is driveable again, but it does not last(about 30 miles). I changed the plugs and wires also the crankshaft position sensor. The problem still exists.
Any suggestions.

 

Have you checked the coilpack out? If it misfires bad enough to make the car barely drivable, usually the points toward a bad coilpack.