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1997 jeep grand cherokee... missfires... idles rough when stoped.

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  • tpetto Sep 17, 2008

    I also have a 97 Grand Cherokee, started acting up a while ago with the need to cycle the key a few times to prime fuel for start up. Now I have developed very rough idle, especially with foot on brake in gear. Smooths out and runs great when I get over1K rpm's. Also getting engine code 43 for misfire in cylinders. Does this all add up to a pressure regulator issue??
    Any advise/input would be greatly appreciated.


  • yadayada
    yadayada May 11, 2010

    What is your mileage on truck? do you have any trouble codes?

  • D B May 11, 2010

    When was the last time you had it tuned up plugs wires etc.

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  • 422 Answers

Hi there, sounds like a bad fuel pressure regulator. a bad regulator will cause it to misfire and idle rough. also does it run good at higher rpm if it does i would be 80% sure that would be your problem

Posted on Aug 28, 2008

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