first of all 1.35-1.5 bar is not safe on pump gas. You can get away with 1.3 bar if you are on 93 octane, but not 1.5 bar. If you are getting only 91 octane at the pumps like here in CA you generally dont want to boost over 1bar as the stock ecu will just pull timing. The wheel speed sensors are easy to replace. Just unbolt them and unplug them from the harness and install the new part. For the rough idle, what kind of plugs are you running? If you are running the ngk 3330s it is normal to have a bumpy idle. Also what is the number of the codes being thrown?