The ISCV is the Idle Speed Control Valve. It plugs into the top portion of the intake manifold towards the front of the engine, and I believe it has two coolant lines running to it, as well as a 6 wire connector.
The "sensor" on the intake with the banjo bolt sounds like the cold start injector. From your description, it sounds like this is physically present, just not plugged in.
The IDL circuit is a part of the TPS. I believe it tells the computer that the throttle is closed, and that the engine should be idling at that point.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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