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Few other ideas and things to check.
The S14/S15 SR throttle body has a wax-based idle control. Yes you read that correctly. You'll notice a cam with a few hash marks under the throttle body, as the engine warms up, the cam adjusts and drops the idle. This is mainly a cold start fix. The FSM has ways to test this out. So make sure your TPS was set to ~0.5V with a warm engine otherwise it'll drop to something like 0.25V.
Is the neutral switch from the trans connected to the ECU? Mine didn't want to idle correctly or trigger the VTC until I fixed the neutral wiring in mine.
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