I have a 2007 Nightrain and sometimes when riding the engine shuts down. The check engine light comes on and I can hear the fuel system re-charging itself, although none of the lights (dash, tail, and headlight) shut off. It just shuts down. It re-starts fairly easily, I have installed a power commander but this problem exsisted before the unit was installed. Sometimes when riding it stutters. This condition exsists either when the engine is hot or cold. Can't figure this one. HELP!