New gmc s15

Discussion in 'Member Introductions' started by jusitnb, Apr 13, 2013.

  1. jusitnb

    jusitnb New Member

    Hey guys,
    Picked up a little 1989 s-15 about a month ago. Been nothing but problems from the gate, but I'm fixing stuff as I can. I was wondering if anyone could give me an idea about this problem that started yesterday.
    Truck surges at idle, and cuts out from time to time while driving. when idling it revs up and then drops almost enough to kill it, then picks back up again. about a 1.5 second rev, then quick drop, then rev again. I don't know anything about what kind of sensors it has and whatnot. While i'm driving I can feel it stumble every once in a while. Was running great the day before. I don't want to be driving it around if it's going to leave me stranded.
    Let me know what you think.
  2. donyms

    donyms Epic Member 5+ Years ROTM Winner 1000 Posts

    Welcome to the club, it's great to have you aboard. I can't help you with your problem but I am sure someone will be along soon to help. :glasses:
  3. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    Maybe a small crack/break in a vacuum line.

    Do you have a vacuum gauge?
  4. reggiecab2000

    reggiecab2000 Epic Member 5+ Years 1000 Posts

    ohhhh... the joys of chasing vacuum leaks! definitely a probable cause
  5. SurrealOne

    SurrealOne Former Member ROTM Winner 1000 Posts

    I can't help with your issue but wanted to welcome you, here! :great:
  6. retired2001

    retired2001 Epic Member 5+ Years 5000 Posts

    Welcome to the G M T C ! I vote for "vac.", too!

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