I would add my vote of confidence for Claviger here. I had a good tune with an unpredictable faulty idle issue for years. He was able to iron it out by taking the stepper motor out of the idle game. My O2 sensor is ON, by-passed. The sensor sees a constant signal. It is not reading the gasses in the exhaust. My bike rocks with just RamAir, cat deleted and TOR slip-ons.