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Hi Mark, the mixture screw is not going to do it.
lowering the bottom differential chamber pressure with the pulse valve returning fuel to the tank lowers the diaphram in the fuel head which lets more fuel flow into the orifice in the top chamber and that richens the mixture.
you turn in the 6 seperate spring tension screws in the top of the fuel head to do the same thing mechanically and then leave it.
you have to do the injector flow test with 6 little bottles like has been posted here to do that accurately between all injectors.
to show the lambda box is not needed on an '86-'89 reach under the seat and unplug the big multi pin prehistoric harness plug from it and you will see that the motor runs just the same without it...
only unplugging the oxygen sensor may work well enough on your car and is simpler if you think the AFR's are acceptable at high rpms and boost so just leave it that way if that works good.
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