So I have a 96 Evo 4 and have put a Evo 6 engine in and just recently a walbro 255 pump and the Evo 6 ecu. Since putting ecu in (followed steps in thread from here) the car looses power at low revs around 2-2500 rpm feels like it's bogging or just struggling real bad but then all of a sudden all power kicks back in? But if I'm feeding it foot flat full boost it runs fine? Evo is pretty standard performance wise. Could this be a cylinder dropping out or maybe a fuel problem? (Used to do it with old stock pump driving at 50kmph) help would be much appreciated!