After I put in 19lb 4 pintle injectors and a MarkD chip I was running rich. So far I have turned the screw about 3.5 - 4 turns lean and still get 1222 (lambda sensor) cel at idle after about 2-3 minutes, then it goes off on it's own.
The motor runs great and I am happy with it. As to making the mixture richer I have just been guessing on leaner so I think you just need to keep turning it lean or rich until it runs right.
To really know you need to have the engine diagnosed with a proper air/fuel ratio device.
