Trying to help a buddy fix his YJ, Its a 95 with the 2.5L, motor is stock, 5spd, jeep has about 70,000 miles on it.
Basically what is happening is between 2000-2500rpms there is a hesitation or it will stumble and will not accelerate any more, sometimes it will back fire. Happens a bit in 2nd gear, but mostly in 3rd under load.
When the Jeep is cold it seems to run fine. Becomes an issue after it warms up.
Also the Temp gauge is reading low, usually stays around the first tick mark above 100. We still get really good heat.
Changed the following:
Cap, Rotor, Wires and plugs are good.
He is picking up a TPS sensor in the morning and will get a new Theromstat gasket so we can see if the stat is stuck open. The cat seems solid when we bang on it, no rattling or anything. Were debating on the CPS, does the 95 have the same harness issues?
We have both done a lot of searching; seems others have had this issue with a ton of different solutions.
Sorry for the late reply, this is for a buddy and we haven't had time to mess with it... We did check the codes and we had an o2 sensor code, with a lean and rich condition. We did replace the sensor. I believe we also had a #3 Cylinder Mis-Fire.
We were also thinking timing, but yes 2.5L so computer controlled. I did check it still and it was a few degrees before TDC