so when i drive my car it runs fine until it hits 3500 rpm then it cuts out. the coils are good, new wires, cap, rotor,etc. i know that one of the coils turns off around 4000rpm if im wrong tell me but that might be the case if so how would i fix that.i saw that u can make it so both coils stay on but i didn't get a clear understand about how to do the mod. Thanks