The PE box can be programed to give any kind of fueling at any rpm level but usually it "traces" the stock fueling curve. The PE boys told me they have a great deal of respect for the engineers who designed the stock fueling curves. I don't believe redoing the ECM would necessilary help because it still working through the VP44 cpu. If it sends the VP44 too big of a number and the VP44 cpu thinks that number is a zero. Ala, why fueling boxes provide more fuel than timing boxes (PE vs EZ for example).