We installed a FAST EZ-EFI system on a 426 Hemi Crate engine. Overall drive ability is good and highway speeds are fine but it has a slight stumble and seems lazy when you stomp on it to take off hard. It is suppose to be a "self learning" system but does have tuner adjustability. Has anyone every dyno tuned or even data logged with this system? We just did a clutch and rearend gear swap in it and think some fine tuning would really bring it to life. It has a Viper spec T56 and 3.91 gears behind it now. Weather permitting we plan to drive it to the Mopar Nationals in Columbus.