When i try to start my motor it fires and dies like it backfires but want run, I just rebuilt the motor and it was running OK, but it was not charging battery so i checked the stator it had a broken wire i replaced it and when i started it up again i had this problem plus i here what sound like spark from coil and coil lead, i disconnected the rectifier and stator from the main (RED WIRE) to see if that made any change "but no" my plugs seem to spark OK but not continuously they seem to go, stop, go, stop, but with a nice blue spark , its a 1976 65hp 650 mercury. running out of options.