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  • rough idle

    A guy I work with has a 93 grand, I am not sure what motor it has though. when the humidity is high his jeep doesnt like to idle very well. it is a little better actually when the a/c is on then when it is off. any ideas on what we could check

  • #2
    Since the '93 was only equipped with the 4.0L 6 cyl engine, my first off the wall guess would be the O2 sensor.

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    • #3
      Standard plugs, wires, and cap and rotor. Would be a good start. Cant hurt to replace them and see what happens, but the O2 sensor may be bad too.

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