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Oh crap, Guess ya just have to find a source for them.
They are low saturation voltage drivers. New ones are impossible to find in the US so most of us recycle good ones from bad ECU's.
The ISC does do more than just manage idle. It's also emulates a dashpot to keep the engine from stalling when you close the throttle.
Anytime you read 0 ohms across one of the ISC windings you can count on the driver being blown. It's also common for IC105 to be blown when C106 leaks and shorts the ISC trace under it to +12.
Steve
No wonder in the weeks leading up to my car really dying (read: clicking from the ECU and not starting, if it would start it wouldn't idle) it would die if I floored it then backed off the throttle.