Hey all my engine will shut down when it reaches about 150-160. anyone know why this is? I just replaced the headers, ypipe no cats, plugs, wires, throttle body, k&n fipk, and a msd 6a ignition box. Please can anyone help with this situation im going nuts lol. I dont know about codes because i dont have a reader yet. The car was doing this before i did all the current mods. I was told the plugged cats was causing the problem. I didnt install the rear o2 sensor simulators yet. they are still with fed ex due to the recent storm here in fl. Would this cause the problem? also the car wont start for some time? im stumped