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Over the weekend I installed an alarm on my S15. After the install I started it up and it's idling between 1500-2000rpm even when it's warm. The only thing I tapped into with the alarm was the RPM wire from the ecu for the remote start. I tried disconnecting the RPM wire and there was no change in the high idle. I checked the TPS voltage, the IACV, the timing, vacuum leaks, I have no idea why it started doing this all of a sudden. Any help would be awesome.