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From what I know about tuning...which isn't much :(

I had a GMC Sonoma that I could tune with my laptop and as I modified it I found that I got that problem. What I learned is there is something called a Idle Air Control and what happens is the computer sets the RPM's at idle based on several factors. What most likely has happend is at a certain temperature/rpm there is a hole in the tune-up in the computer that GM put from the factory and at that temperature/rpm etc it get's confused and the idle drops.

I would only be worried if it stalled, it is perfectly fine for the idle to bounce around a bit, it isn't hurting anything.

Hope this helps?
 

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I remember that with the studebakers. that started around 1950. i just read an article in "old autos" newspaper, last night about a 1950 (?) studebaker pickup and that fact was noted.
subaru had something similar many years later.
My 1982 Subaru Wagon had the hill hold....that was a nice feature!!
 
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