FiTech EFI system

rednesss said
I've been having a weird problem lately. It will be idling and then all of a sudden the IAC count will shoot up and it will go from like 800 rpm to 1300 rpm's and then go back down. Seems to stop once it's at running temp of 180-190, but before that it's kind of annoying.

Are you using timing control?

There's an IAC loop rate up and down, it took a bit of fiddling to get mine just right to avoid major spikes in the idle speed. Under pro tuning and fuel control, I also reduced the idle learn rate to about 5 to get a good steady idle.