I have a co550 code electronic control unit malfunction (ecu) could it malfunction because it needs to be reprogram or relearn I replaced some parts bought a used electronic throttle body new mass air sensor new upstream o2 sensor direct fit catalytic converter after market, I have bad acceleration bad gas mileage the car idles rough in park, brake, abs, steering, traction control lights are on I have a 2005 gtp grand prix 126800 miles if anyone is familiar with this code please help Thanks
