[Diy_efi] idle control 1227747

[Darryl M Gilbert]

Hello: 1227747 355cu in SB Chevy. Trying to figure out how to get idle
down to the idle speeds in the target idle vs coolant table. Currently
ECM wants to keep the engine running approx 1100 RPM, with 80 IAC steps.
Temp is at 171 deg F. TPS reading .51 volts at idle, but Idle speed will
not come down to target idle table speeds?? Is there a switch that tells
the ECM when to invoke the target idle table?? I think IAC steps vs
Coolant is for Fast Idle when cold?/ Any help will be greatly appreciated
Darryl..