boat sat up for 2 yrs holly 650 rebuilt and runs great then cuts out backfires runs rough. back rpm back to 2500 runs great after idling or running at 2500 for a few minutes runs great and stays nice the the process starts all over after 2 or 3 minutes. I have heard the ignition on this series had some demons all wiring seems in good shape and coil pack seems fairly decent. any help would be appreciated. got to get back on the lake!!!