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Thread: Idle surges won't rev past 1500rpm

  1. #1
    Join Date
    Sep 2018
    Location
    Homer Alaska
    Posts
    8

    Idle surges won't rev past 1500rpm

    My swap on a 93gmc with a 99 5.3 is nearly done, truck starts and idles fine but won't rev past 1500rpm? Then it starts to surge during idle, any ideas where to start been working on and off of it for months eager to drive it, thanks

  2. #2
    Join Date
    Jan 2019
    Posts
    5
    Was VATS deleted? Almost sounds like it's in a limp mode of some sort...��

  3. #3
    Join Date
    Sep 2018
    Location
    Homer Alaska
    Posts
    8
    I have a guy coming over with hp tuners today, hope its something obvious

  4. #4
    Join Date
    Sep 2018
    Location
    Homer Alaska
    Posts
    8
    Quote Originally Posted by Millertime View Post
    Was VATS deleted? Almost sounds like it's in a limp mode of some sort...��
    Timing was all over the place bad tune we flashed my spare ecm all good now

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