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Check the ECU for codes using the consult port. NDSI is a good one, and there's a few others. While you're looking, it's pretty easy to monitor the TPS voltage from closed to wide open in order to determine if that is an issue.
Check for vacuum leaks and verify base timing has been set, since those are the major causes for idle hunting. I'd guess one of the vacuum ports off the intake/throttle body isn't capped off, or has a cracked rubber line.
Once you get that sorted out and since you have a S14 SR, those actually use a wastegate solenoid to bump the "stock" boost to around 11psi. The wiring is there, you just need something like a MAC valve and connect it so that it bleeds air from the vacuum line going to the wastegate. Then really enjoy the full value of a stock-ish S14 engine, because running off base wastegate pressure sucks, feels so sluggish in comparison.
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