I had to help make some modifications into the engine harness to the idle control valve. I had originally prepared to make use of a two wire bimetallic style valve, but I will probably be using a Screw-in model idle Command valve. This valve works by using a stepper motor https://toyota4ageengineforsale08753.ltfblog.com/37798641/a-simple-key-for-toyota-4a-ge-unveiled