Was tinkering with the idle adjustments the other day.  Set the idle mixture screws at best idle, and then played with the idle speed stop.  I can completely remove the idle set screw and the car just sits there at 900 rpm.  Should I back out the little, hard to get to set screw that holds the back butterflies slightly open?  Have I said lately how much I hate my Holley carb?

The idle stop solenoid is not energized when I'm doing this.  It is wired to the compressor engage switch.

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Check  the opening of the secondary throttle plates.  The 4 barrel section may be open a tad.

OK, I backed off the back barrel set screw and now I can get it down below 800 rpm.  Not sure if Holley would like that solution, but it worked.  Holley says that screw should be backed out 1/2 a turn after it contacts the back barrel stops.Don't know where it is now in relation to that.

I was also able to turn the idle mixture screws in about 1/2 to 1 turn for best idle.

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