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poor idle / stalling

Discussion in 'Chevy Trucks' started by Mainer, Nov 29, 2004.

  1. Mainer

    Mainer Junior Member
    from Maine
    Messages: 26

    Wanted some advice on my 87 chevy 305 TBI
    it will idle iratic then idle so low till it stalls. also down the road acts like its starving for fuel. did a fuel filter. it was plugged big time. was told it could be the TPS (throttel postion senser) changed it. little better but still there. it comes and goes. going foolish trying to get this right.
    any help would be great...
  2. Tarkus

    Tarkus PlowSite.com Addict
    Messages: 1,113

    This may not be it but the first thing you want to check is the gasket between the TBI unit and the manifold. They do go bad with age.
  3. mgilman

    mgilman Junior Member
    from maine
    Messages: 1

    sounds an awful lot like a vacuum leak
  4. Mainer

    Mainer Junior Member
    from Maine
    Messages: 26

    Hi I thought it might be a vacum leak. but it happens off n on its not consitant. when it act up service engin soon light comes on. when it goes out. back to norm?? i dont know...lol
  5. JMR

    JMR Senior Member
    Messages: 567

    Could have an EGR valve sticking open occasionally?
  6. Tarkus

    Tarkus PlowSite.com Addict
    Messages: 1,113

    I had a bad manifold gasket a few years ago and it was not consistant either
  7. ace911emt

    ace911emt Member
    Messages: 83

    if you have a check engine light scan it first. the info you need is in your truck, the money you spend guessing will soon exceed the scan cost (or free if you have a friend) sounds like an egr sticking but test test test.
    you don't call your friend in Florida and ask if he thinks it will snow. you watch the weather for your area right?
  8. Tarkus

    Tarkus PlowSite.com Addict
    Messages: 1,113

    My leaky TBI to manifold gasket never coded anything though for what it is worth. They do not usually last the life of truck.
  9. DJ Contracting

    DJ Contracting PlowSite.com Addict
    Messages: 1,392

    Like it was posted, look for vacuum leaks/stuck egr valve/or poss. O2 sensor also if the filter was that bad you should replace the in tank fuel pump could leave you stranded and you don't want that during a storm.
  10. chevyshovelin

    chevyshovelin Junior Member
    Messages: 20

    :waving: I had this problem with a 1985 chev. blazer 305 5.0,after several different shop visits,i ended up getting a carb from a junkyard,it worked. :nod: