I had for making some changes for the engine harness with the idle control valve. I had originally prepared to make use of a two wire bimetallic kind valve, but I are going to be using a Screw-in type idle Command valve. This valve makes use of a stepper motor https://jdmtoyota4a-ge98639.blogpayz.com/39469180/a-secret-weapon-for-toyota-4a-ge