1992 TBI idle hunting at stop light

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Jun 22, 2015 | 04:55 AM
  #1  
Hi everyone. New here, but this seems like a very good community of enthusiasts. I have a question I need guidance in. I have a 1992 full-size Blazer with a 385 stroker. Now I am working on tuning it and am headed in the right direction I believe. The truck is idling relatively well when in park. The problem is when I am sitting at a stop light with the truck in drive, in a short time the truck will begin to idle hunt. It gets so bad it will actually make the truck rock and lurch forward. I can't remember off the top but if I had to guess I would say it is jumping 300 or so rpms when it does this. Does anyone have any thoughts to this or where to begin looking? Thank you.
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Jun 23, 2015 | 02:06 PM
  #2  
Re: 1992 TBI idle hunting at stop light
Had a bit of the same issue and it came down to having to make the iac relearn itself.
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Jun 23, 2015 | 02:11 PM
  #3  
Re: 1992 TBI idle hunting at stop light
Wife'sCar,

Thank you for the reply. I am new to the tho setup, would you describe how this is done? Thank you.
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Jun 23, 2015 | 02:15 PM
  #4  
Re: 1992 TBI idle hunting at stop light
Here's what I did.Name:  Screenshot_2015-04-21-15-04-07_zpsdeantyzc.png
Views: 86
Size:  238.1 KB

1992 TBI idle hunting at stop light-screenshot_2015-04-21-15  

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Jun 24, 2015 | 10:33 AM
  #5  
Re: 1992 TBI idle hunting at stop light
have you checked for vac leaks? worn throttle shafts? cleaned IAC? You won't be able to tune around mechanical issues...
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