surging issue

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by zombieclod, Apr 6, 2009.

  1. zombieclod

    zombieclod New Member

    Hello all,

    What's the best way to check for vacum leaks on a vortec?? My truck is a 1997 5.7.

  2. Z71_guy

    Z71_guy Epic Member 5+ Years 1000 Posts

    welcome to the site, you can always use the carb spray trick
    have the truck running and spray carb spray where ever there are vacuum lines and dont forget around the intake. just listen for the engine to stumble or surge
  3. 95CTburb19

    95CTburb19 Epic Member 5+ Years 1000 Posts

    Does your truck rev a few hundred RPM's when sitting at a stoplight with your foot on the brake? I know my 99 always does, I never found a fix for it....
  4. zombieclod

    zombieclod New Member

    No, it surges between 40 and 50mph. It doesn't do it at any other time or speed. I thought it might be the TC hunting (locking and unlocking), but I tried driving it in third gear and it still surges.
    It's not a severe surge just aggrivating! LOL
  5. bd1326

    bd1326 Rockstar


    sounds like the problem my 99 silverado had. when i started it it would idle higher than normal, at a stop it would either idle real low and stall or idle real high. it ended up being my throttle position sensor.
  6. 95CTburb19

    95CTburb19 Epic Member 5+ Years 1000 Posts

    Thanks I'll check it out! Mine will never stall though and seems to idle normally. I think the fact that it has 202k on it might play into it somehow. :lol:

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