I have a jeep wrangler 4.0L, it misses when I first take off but once you go a

[Andy C]

couple miles it straightens out? I have changed the spark plugs, plug wires, distributor button, and the coil. I also thought it might have been an injector so I ran two bottles of Lucas Fuel Injector cleaner though it, it didn't help. I have sprayed the engine down with water and carburetor cleaner and couldn't find any leaks around the head gasket. The check engine light also does not come on, ever. Any help would greatly be appreciated.