Tipping in to load conditions pops a wrench it goes lean and back into open loop. I read somewhere this is because the map can only read so much boost. So online they say you can get a one way valve that fits in front of the map to keep it from sensing positive pressure. Possible this is not the case, and there is something else wrong.
Substitute the word load for boost . Manifold pressure is building faster than normal while increasing load. It goes lean everytime. I really am not sure why.
Megasquirt does get good recommendations but it is not street legal.
Using RC 310cc saturated type injectors. The calculator suggests should be right on a 1.9L at 180-200whp.