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Missing "Z"

This is a discussion on Missing "Z" within the General Help forums, part of the LSx Technical Help Section category; Greetings All, I have a 99 Z-28 with about 150k miles and every since it was new it has had ...

  1. #1
    Junior Member
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    Oct 2009
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    Black
    1999 Z-28

    Missing "Z"

    Greetings All, I have a 99 Z-28 with about 150k miles and every since it was new it has had a stutter-miss at 4800 rpm for about 100 rpm then kicks back in and runs to the shift point (A4) I have replaced the plugs and wires 3 times, the only mods are SLP cold air induction, SLP under drive harmonic balancer and after mkt. exhaust. It has been hooked up to the GM diognistic machine and repeated for the dealer. It kicks out NO codes and does it at 4800 in every gear every time! My dealer and I are stuppped. Any ideas? Thanks, Bill

  2. #2
    Veteran 0rion's Avatar
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    Aug 2005
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    ohio
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    22,520

    98 Formula
    06 duramax

    have you logged it and looked at fueling? Have you done any trouble shooting on the MAF? That's my best guess going by your description.

  3. #3
    Junior Member
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    1999 Z-28

    Can the dealer do this with their equiptment? If so I'll get them to check, Thanks, Bill

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