I raced my friends ls integra it is stock 5spd. I have 1996 200sx SE-R a gready catback, act clutch, CAI. He walked me like my car was standing still. Like I was going against a funny car. In the far distance I saw a twinkle of light as he left my view. It was absolutly crazy. At the next light a toyota tercel beat me. I am not lieing. I am pissed. I just got this car and I know this car is not suppose to be this slow. I have changed the front o2 sensor, spark plugs and checked the gap, wires, rotor, distributer cap, oil, Timming done at nissan, fuel filter, EGR valve checked. No leaks in any hoses. MAF is ok nissan checked. The car smells rich and my car boggs around 3500 to 4500 rpms. It seems like the car is misfireing throughout the rpm range on every gear. Is my engine gone ? Do I need to reset my ECU??? Is this electrical? I have searched but found no answers. Please help me solve my problem. This may also help others with the same problem. If not I am just getting a new engine.