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    Once in a great while if I let my 1999 Jeep Grand Cherokee Laredo I6 4.0L idle for a little while it will idle wrong. It will spike up to over 1k RPM. I have recently done spark plugs and the coil packs, brakes (rotors and pads), cleaned my Cold air intake and a few other small things. Anyone know what this could be? Let me know if you need more information! Thanks!

  • #2
    My 98' does that sometimes and I figured out it either when the water pump, a/c or other component kicks on. Mine jumps from about 500-750 t 900-1200. It's a 4.0L thing.