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Re: Help, High idle problem TBI, how the heck do you get it down.
One of mine idled high, I turned the idle screw out some. But for whatever reason they have a plug that covers up the screw. I think there is a way to “reset” the IAC and TPS but not 100% if that adjusts idle speed or not.
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2000 GMC CCSB 454/4L80 6” lift SAS
1999 Chevy CCSB 454/NV4500 6” lift
1999 GMC Yukon 350/4L60 4" SAS
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