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  1. C

    98 4.0L Weird idle?

    Thank you everyone for the advice! I forgot to mention that the engine has been swapped in the past with a 1996 engine. During inspection, I found a bolt missing and a very loose bolt in the top of the bellhousing. Do you think it would cause the CPS to loose sync when the engine vibrates or moves?
  2. C

    98 4.0L Weird idle?

    I bought a 1998 Cherokee Classic recently and it's giving me one heck of a headache. The Jeep will idle for a minute, then fall flat on its face. I've replaced the O2 Sensors, IAC, tried a different ECM, plugs and wires, TPS, and the MAP Sensor. I've cleaned a ton of grounds but still no luck...
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    98 4.0L P0122, P0123, P0700, Wont Idle?

    Hi, i have a 1998 Jeep Xj Classic and it wont idle. I have replaced the TPS, IAC, and have tried a different PCM, same issue. I put the code reader on it and i get these codes: P0122, P0123, and P0700. The jeep will start fine and idle for a few seconds, then the RPMs will fluctuate and...
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