Have F15 X5 3 L N55 yesterday, it stumbled on start, restarted it, drove a little and parked at a store, came back after 15 minutes, had very rough idle on start, and all kinds of warnings came on. Shut it down and restarted started and ran OK, but the display screen was blank. This morning it started right up and the display screen was back on, no codes or check engine light. Scratching my head as to what could be wrong, apprecitae the help