I have a 2000 s2000. The vtec is engaging properly, that has all been checked. With the vtec unplugged, so it does not kick in, the car runs great. However, with vtec plugged in, when it kicks in, the car runs horrible, like it is starving for fuel or air, and it sputters and has no power at all. It has plenty of fuel pressure, is getting plenty of fuel. We hooked up a fuel pressure gauge and an air fuel gauge. It is running right where it should be. Airflow is great to the engine. With vtec unplugged, it pulls hard all the way to 8000 rpms, but when it is plugged in, it runs fine until 6000 when vtec kicks in, and then just has no power. Does anyone have any idea what this could be?