Newest Gallery Photos

  1. Chevy Truck Forum

    Welcome To GMTruckClub.com!

    The #1 Chevy Truck Forum Online

    Online since 2004, we're the #1 Chevy Truck & SUV user community. If you have any questions about your Chevy or GMC Truck, SUV or Crossover, or just want to connect with other GM owners and enthusiasts around the world, you've found the best place on the internet to do that.

    Join Today ~ It's Free

    Registering is Free and Easy! Do it today and we'll see you on the forums soon!

high idle only when moving

Discussion in 'General Chevy & GM Tech Questions' started by gostr, Nov 29, 2009.

  1. gostr

    gostr New Member

    Hello,

    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??


    Thanks
     
  2. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    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?
     
  3. gostr

    gostr New Member

    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.
     

Share This Page