Re: 1995 Cherokee straight 6
Welcome to the garage.
Does the 95 already have separate O2 sensors for the 1-2-3 and 4-5-6 cylinders? If so, i would check if the sensor for the 4-5-6 cylinders. The voltage should change rapidly from 0.2-0.8V. If this seems to be ok, check the fuel trim figures (if possible). If the 2-1 sensor shows a negative number greater then 10, then the PCM is downtrimming the fuel injector puls too much and a lean misfire can occur.