I verified that gasket is on right. I personally lapped the surfaces of the throttle body flat while I was rebuilding. BISS and O-Ring are new as well. My idle is 825 to 850 at a stop when the car is warm, no surging. I also would not be surprised if my old coolant sensor is out of whack, the car could be in warmup mode even though the logger registers the proper temps. I wish I could see that parameter on the logger.
My ABS is disconnected at the front connector and the 60A fuse.
Funny symptom is that the engine will idle up steady as you please when rolling(speed sensor) but the AC idle up will slowly drop from 1300 back down to 700 then up to 800 when stopped. If I try to adjust the BISS up any I hit the typical motorboat idle from the ECU trying to adjust when rolling which settles down as soon as the car stops. TPS measures 10.1% on the logger. It's consistent and repeatable.
I suspect sometimes that a pinhole in the brake booster could be the problem(your braking is a constant when rolling to a stop). I do need to check the throttle plate clearance as well, I set the CTPS by eye with the TB off the car and I don't really see it varying by more than a couple thousandths from what its supposed to be. But it could be a slight deviation in the vacuum at idle too small to see on the gauge.
In my case I think it's being aggravated a clogged fuel pickup screen and old injectors. All of which will be ruled out as soon as I get the remaining parts (Supra pump, AFPR) to install my Evo 560cc injectors and 2G MAS. I will be purchasing a chip from Jeff at the same time. Fuel starvation or a poor spray pattern might explain the idle drop. There is a tad bit of unsteadyness if I accelerate slowly through the RPM range.
I will say that it is way less aggravating than it was prior to the TB change FIAV blockoff. In my case I still have a few too many variable to eliminate before I can totally solve it. The biggest being the fuel/injectors.
