The cruise control itself is vacuum operated. There should be a vacuum line(after the throttle plate) that connects the speed control actuator and I believe the heater control valve vacuum lines together. Make sure that vacuum line is there and in good shape. The other common failure point is the rubber boot for the speed control actuator cable will deteriorate, causing it to not move properly/not have enough tension in the cable.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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