Question about 1999 Jeep Grand Cherokee

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1999 Jeep Grand Cherokee 4.0L mis-firing

I keep getting a check engin light come on and when i get it read it keeps saying mis-firing, i have replaced all the spark plugs (didn't fix it) then replaced the ignition rail but still having the same problem. At 80 km/h it shimmy and shakes with no power and seems to be missing. Does anyone know where to go next??
Thanks

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  • Ray Keckeisen May 11, 2010

    what is the code number and what kind io scanner are you using get back to me

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  • 48 Answers

Put new distributor cap and rotor at least

Posted on May 08, 2009

  • Lucy565 Feb 10, 2012

    4.0 has no distributor........

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