[BlackStealth]

If tuning becomes too difficult then I'd suggest rewiring your boomslang harness from stage 3 to stage 2.5. At stage 2.5 and below you won't have to worry about the I/J map at all. I did this to my boomslang harness after I got tired of the occasional CEL (my car wasn't fooled by the CEL adaptor all the time).

Here's a possible explanation as to what's going on with your EMU setup. Because you're at stage 3 wiring, the EMU artificially extends the original injector duty cycle by a fixed amount. At idle this fixed amount is noticeable and shows up as a rich idle, and as the load increases this fixed amount becomes less apparent. The best way to fix this is at the I/J map 1 and reduce the injector duration at idle. Using the airflow map to fix this weird condition might not work if we look at this example:

Assume we need 1 ms injector duration to maintain a perfect 14.7 AFR idle. If this fixed amount that EMU puts out is also 1ms, we'd get a total of 2ms of fuel at idle which we would see as a rich idle. Now let's assume you use the airflow map with an aggressive -50% correction, that may translate into a 0.5 ms of fuel. But overall you'd still have 0.5ms + 1ms (EMU stage 3 weirdness) = 1.5ms. You wouldn't be able to rectify the rich idle problem. That's why I suggest using the I/J map to fix the rich idle as it can adjust the injector duration directly.

You have many things to consider when jumping in with the boomslang setup. Starting from stage 1 would have avoided many of your headaches, but I guess thats the price you pay for having the wiring convience that boomslang offers.