THIS WAS A RUNNING ENGINE. Had started engine, ran and checked timing etc...Everything was great and all the sudden engine was running and idling and just died. Tried to start and engine will start but instantly dies every time. Got brand new coil. Sent points box back to MSD and it checked out fine. Got freshly checked points box and brand new coil and engine does same thing, starts and dies. Everything is properly grounded. REMEMBER THIS WAS A RUNNING ENGINE. Any ideas what it could be?