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Vac leak. When I got my s14 it had like 3 or 4 vac leaks, and idled at about 4-5k. Mine was turbod by previous owner and then garaged for a decade. They disconnected EGR (but left everything in) and the vacuum tree between the firewall and intake manifold was completely open to atmosphere, there were also two vac ports on the side of the plenum that were completely exposed. I would also check along the intake, and maybe the brake booster line. Fwiw I tried using carb cleaner to find my leaks, and it never worked.
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