Will try to be brief, but lots to the story. Have 87 Westy with idle issues. New items include engine bay wire loom, TPS and GW throttle body. Idle is low and sometimes erratic. Idle control valve does not vibrate/hum but will open/close on bench test. idle Control Module and valve has been changed out with spares I have to no avail. All grounds have been cleaned and secured. So, my question centers on whether or not the ECU can partially function but still be dysfunctional as to the idle. Any thoughts/ideas would be appreciated.

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