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Thread: 2003 STS - Rough idle and hesitation on takeoff

  1. #61
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    Location
    MD Eastern Shore, Kent Island
    Age
    77
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    56,842

    Re: 2003 STS - Rough idle and hesitation on takeoff

    Two coil cassettes going bad at the same time is a stretch. They're both identical except for color and can usually be found for not a lot of bucks at junkyards - any year from 2000 - end of 2003.

    Clean the connector boots - use Q-tips and alcohol to swab out the insides of the coil and plug connector area, and use a dab of dielectric ignition grease (toothpick) around the inside of each boot end.


  2. #62
    Adamhon is offline Cadillac Owners Member
    Automobile(s): 2003 Cadillac STS
    Join Date
    Feb 2012
    Location
    Indiana
    Age
    35
    Posts
    35

    Re: 2003 STS - Rough idle and hesitation on takeoff

    I replaced the rear (right) cassette, it is running good now. Thanks for all the help!

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