It might also be the idle speed control valve. Test the plug or listen to see if it makes a noise when you shut the car off.
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'89 Turbo 5spd Targa - 3" exhaust, RT Downpipe, Suprasport elbow, big fmic & pipes, Tein HR coilovers, NGK plugs/wires, Lexus AFM, Apexi SAFC, ARP head studs, TurboXS mbc, removed all A/C garbage, elec. fan, rebuilt CT26, mild port matched turbo hot side
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