O2 sensor locations, 2004 jeep wrangler 6 cyl

SOURCE: location/testing of crank sensor 1995 jeep wrangler

Should be on the bellhousing on the drivers side just where you need rubber arms to reach it.Should have no continuity between b&c terminals (check with ohmeter) Harness plug is usually on the drivers side between the master cyl and the back of the engine (unless someone moved it)

SOURCE: Jeep Wrangler 6 cyl. idles up and down

Have your oxygen sensor checked, one of the symptoms of a faulty oxygen is an up and down idle.

SOURCE: jeep wrangelr Crank Position Sensor

wall5552: there were two engines used in 1992 Jeep Wranglers.
A 2.5 liter and a 4.0 liter. HOWEVER>>>> The location for the crank angle sensor is the same for both.
It is located on the bell housing up near the front at about the 10:00 PM position.
The Cam position sensor is located in the Distributor on both engines as well.

SOURCE: Jeep 1997 Wrangler. Gear shifting very hard

synchronizers are going bad a used trans would be cheaper than a rebuild due to the labor involved

SOURCE: 98 jeep wrangler 4.0 6 cyl auto spits and sputters under load

It can be a problem with one of the injectors. What is odd it that the ECU has not set a code for a misfire. I would have the ECU scanned even if your check engine light is not on. With a misfire the ECU should have set a code on which cylinder is missing. I would suspect one of the injectors is malfunctioning.