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  1. #1

    Default high idle only when moving


    I have a 99 suburban with a 5.7 vortex with an [COLOR=blue !important][COLOR=blue !important]auto[/COLOR][/COLOR] tranny. When I am driving and let off the gas the rpms stay at around 1200-1500 even if I am coasting in N. When I let off the gas to slow down it wont. When I come to a complete stop they will drop. If I am stopped and in park and rev the [COLOR=blue !important][COLOR=blue !important]engine[/COLOR][/COLOR] it comes down to a normal idle. This just started a few days ago. any idea what it could be??


  2. #2


    The first thing that comes to mind is a dirty throttle body. I would clean the throttle body and mass airflow sensor while you're at it. Have you checked for any trouble codes?

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3


    Checked codes nothing came up. I will try to clean maf today. I just don't get why it only does it when the truck is moving.

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