Now I feel like a dumbass lol.
I didn't even check to see if he said, and if I was replying, MAP or MAF. Thank you all who corrected me.
@mr2 newbie-you failed to mention, in your original post, that you had a SAFC. That could cause a problem if not set up properly. And again, the MAF/MAP does not directly control your air/fuel ratio. It just reads the amount of air entering your engine, and tells that to the ECU. Your ECU, from this signal a a few others, decides how much fuel to inject. I'm not an expert on piggybacks, I don't really know much about them, but I believe they manipulate the output voltage on the MAP, therefore sending the ECU a signal different from the actual reading, which would cause it to inject different amounts of fuel for a given amount of airflow.