My son just bought a 2006 cobalt ss s/c and he's been having a little trouble with it. We have no idea what mods if any have been done. The problems he's having are rough idle. He was getting O2 sensor codes but those were replaced. The bank 2 sensor was very close to side of the undercariage and wires were damaged so I'm guessing larger exhaust was installed. So we moved the sensor down a bit. Now he has a MAP code coming up. Can anyone recommended a good mechanic and good tuner in the detroit or windsor area. I saw the list for tuners in another post but it was a couple years old and nobody has responded. We just need someone to tell us what has been done to the car and someone reliable that can do other mods for us. And also looking for a good tuner.