codes cleared took it for a drive and code 24 popped up again after about 10minutes, wouldn’t let me boost fully and went all slowy  Idle Air Control looks like I’ll be pulling it out this weekend   

I didn't do it today, but quite a few months ago lol.  I finally figured out my shutdown issue on my Type RA.  The issue was it would start fine, run perfectly during normal even spirited driving.  When I'd go on track at say manfield, and start giving it some absolute spanking, about half track point the car would completely shutdown. I'd have to key off, and then key back on and away we'd go again.  It was repeatable and I couldn't figure it out for the life of me while at the track.    So, replaced the battery because A. it was old AF and dying easily.  Thought it resolved issue up until a couple months later I was at a gymkhana event here in hastings and it died under, again, heavy load, but this time the battery light was now coming on.  Sure as heck, I checked the voltage output on the alternator and I am getting bubkiss.  Quickly dip home, pull out a crappy old looking spare alternator I had, remove the old alternator, and the terminal for the positive is absolutely COOKED, with the nut literally welded itself to the alternator...  Slap this new alternator on, and rush back to do the last runs and fixed. Now to just do a cambelt/idler change as these are due. 

Thank youuuiu 🙏

https://uk.subaruownersclub.com/forums/topic/2366-manually-reading-ecu-codes/ has clear codes process in the post.

I managed to find an o2 locally, fitted sweet and plug matched, $100, looks like it come from aliexpress originally haha. arrived today. Installed it and took it for a drive. No check engine light, but the codes still showing when checking ecu memory, I’ve forgotten how to clear codes on the obd1 system. So I can clear codes and take it for a long drive to see if anything pops up. I’ve  got green plugs and clear plugs under the steering wheel. clear plugs together shows the codes through the flashing check engine light, green plugs together doing nothing. Am I forgetting something?