If your Throttle Body Springs are Sitting a Bit Wonky, chances are your Original Bushings are Shot.
Unfortunately, Heat Cycling & Age has a Cumulative effect on the Z32's Original Plastic Bushings, Degrading them to the point of Failure.
Advances in Modern Engineering Plastics, have Vastly Improved the Service Life & Heat Cycling Capacity of Many Such Automotive Components.
One of these Modern Engineering Plastics is Delrin,
Key Features
Excellent Corrosion Resistance
Excellent Creep and Wear Resistance
Excellent Dimensional Stability
High Lubricity
High Resistance to Organic Solvents
High Tensile and Flexural Strength
Continual Service Temp -50 °C to +150 °C
Outstanding Abrasion Resistance
With something as Critical as your Throttle Bodys, Don't Settle for Cheaper Soft Plastics, or 3D Printed Bushings, Insist on Delrin for your Z32.
 
Youtube Video on Making the Bushings