My 04 750 is stalling when it drops to a idle. It runs fine and does not do it 100% of the time and it starts right back up everytime. It is stock other than RS-3 bolt-on and the dealer is telling me I need a Power Comander. Is this true? Can they map the stock ECU? I don't want a PC. I would rather put stock pipe back on. If that is the case. Help before I return to stock.