Have put Evo 6 engine, ecu, 255lph fuel pump and 560cc injectors in my Evo 4. Now I'm loosing power! Just randomly engine power cuts out and then cuts back in. WOT with high revs will run fine. I'm still using Evo 4 AFM would this be the problem? Or maybe coils failing? Fuel filter has done about 5000km about 2500miles roughly. Please help!!