I am experiencing intermittant electrical problems with my '06 600 sdi. At around 7000 rpm cruising and then punch it it stumbles and misfires bad. IT only does about half the time or instead of stumbling, it will lose a cylinder momentarily. tried dry gas thinking water but eliminated that. One time it when into limp mode and one time the gauges went crazy. Another time it happened, it killed the motor and started into reverse mode. The dealer cant find it due to being intermittant. any ideas?