not sure how the SOHC's are, but I found a huge vacuum leak from one of the metal vacuum lines coming off the throttle body on my DE recently. I had a plug there and it must have popped off under boost. I found it when I did a boost leak test using a bottle of soaping water. Fixing that and dialing in the ignition timing really stabilized the idle speed and AFR's.
Just some food for thought. Good luck.
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