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tbi problem -missing down low

Discussion in 'The Garage' started by highrider_44s, Sep 2, 2004.

  1. highrider_44s

    highrider_44s 1/2 ton status

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    i got a tbi 305 and it seems to miss at the bottom end when you excellerate especially under load but soon as it hits 2500 or so and it runs fine /forums/images/graemlins/thinking.gif wtf /forums/images/graemlins/dunno.gif
    any way does anyone have any ideas
     
  2. tx_sub

    tx_sub 1/2 ton status

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    check your fuel filter first. when was it last replaced. what kind of shape is the fuel pump in? does it only happen under hard acceleration?
     
  3. highrider_44s

    highrider_44s 1/2 ton status

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    already replaced the fuel filter not to sure about the fuel pump but it runs fine after 2500 it's just below that /forums/images/graemlins/dunno.gif
     
  4. Wingnutt

    Wingnutt 1/2 ton status

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    Now this may sound kinda silly, but my 88 was missing at lower rpm's and it turned out that she needed a new set of plugs and wires. Just a thought. /forums/images/graemlins/dunno.gif
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Vacuum leak?
     
  6. big jimmy 91

    big jimmy 91 1/2 ton status

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    Does it have a mech fuel pump?
    I had a fuel pump brand new with a screwed up spring in it that would cause the truck to run at idle or WOT. normally , but in between it would run like a bag of crap
    A new pump and all was normal again
    Just a thought /forums/images/graemlins/dunno.gif
     
  7. muddbudd72

    muddbudd72 Registered Member

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    my vote is plug wires and plugs. my 90 was doing same thing. plug wires were only 1 yr old. changed fuel filter and rebuilt tbi still had problem. changed wires and ran fine.
     
  8. 91GMCSuburban

    91GMCSuburban 1/2 ton status

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    I have the same problem, and have chaged everything else except wires.
    Wire recommendations?
     
  9. highrider_44s

    highrider_44s 1/2 ton status

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    yea i was kinda leaning on the wires too but was still unsure but you guys pushed me over the edge i'll have to get some and throw them in /forums/images/graemlins/thumb.gif
    i'll let you know if it solves the problem /forums/images/graemlins/peace.gif
     

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