Not an EEC tuning issue - moved to 5.0 Tech.
Start by pulling codes. The CEL doesn't need to be illuminated in order to have codes stored. Some mods doesn't tell us anything about your combo. I'd recommend creating a signature
that details what parts you have installed, so it can help with the diagnosis of your issue. For all we know, you're running 60lb injectors with 60PSI of fuel pressure on a stock 302 bottom end with bone stock GT40 heads. Something like that would definitely dump fuel, so we need more details.