1999 4.0 stutters

Discussion in '1998 - 2011 Ford Ranger' started by Dave1899, Apr 9, 2019.

  1. Dave1899

    Dave1899 New Member

    Can't figure out why it stutters between 35 and 55 mph. It accelerates great and runs down the hyw at 70 mph smoothly. I've replaced just about all the sensors on the engine, replaced the fuel pump and cleaned the fuel system. Any ideas?
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  3. OP

    Dave1899 New Member

    I can't believe I have the only truck with these symptoms.
  4. OP

    Dave1899 New Member

    Could it be the DPFE sensor?
  5. Efisher26

    Efisher26 New Member

    Coil pack replace?

    Sent from my iPhone using Tapatalk
  6. OldTimer

    OldTimer New Member

    Any Codes? Usually if your coil pack goes it's usually on the #4 or even the #3 plug towers. On you tube, ''chris fix'' shows how to check a coil pack, without getting zapped yourself, it does work!
    Dave1899 likes this.
  7. OP

    Dave1899 New Member

    SOLVED.....Had a broken spark plug. Replaced all plugs and wirers and it's running great again. Thanks for the suggestions!
  8. OldTimer

    OldTimer New Member

    A broken plug. Bet that wasn't easy to find! I had a plug which had the porcelain cracked, it was in a 69 Ford Galaxy with a 302. Had to deal with the periodic misfire til it built up a carbon trace!

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