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Do you have the original knock sensors? You might want to see about getting a Subaru mechanic with a SSM to drive it around and see what's going on with your ignition advance. The other thing to check is the small check valve that is installed between two pieces of tubing coming out of the large black box mounted under the intake manifold. It's just behind the power steering pump and (obviously) under the intake manifold. This valve has been known to crack with age and will result in a non functioning IRIS valve.
-Bill
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Retired NASA Rocket Scientist
Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023
Center Network Member #989
'92 Fully caged, 5 speed, waiting for its fully built EG33
'92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension
'92(?) Laguna, 6 spd and other stuff (still at OT's place)
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