How low are you able to set your idle dependably?
What porting do you have stock or otherwise?


How large should the idle screw range in RPM be?
Mine seems to range from ~400 – 800 RPMs

I have a small pineapple streetport (though I am starting to believe it may not be) GT35R and I find it impossible to keep the engine idling consistently at the “stock” recommended 700-750 the manual recommends or even 800. seems more stable at around 900, though my idle control screw (AAS air adjust screw) dosnt seem to be able to supply enough air for this range.

Any ideas or options?
My vacuum seem to be good at lower RPMs (~350 – 400 IIRC but i will check it again if this sounds incorect)

 

Timing really plays a role in stable idle. If you do the idle manually, no ISC, set the rpms in the PFC to 0, then you can get more control of the ignition timing at idle and run much more advance. This really stabalizes the idle and gives good control of the idle rpms using the idle bleed and throttle plate adjustments. I also deleted the wax rod to simplify the TB.

I usually idled at 900 to 1000 with my light fw, streetport motor with the T66 single.

 

Oh how I wish I lived closer to Texas!
Thank you for the post twokrx7