Try to start engine and when in start mode it seem's it want's to start untill I release the key and then die's.I have spark,gas,timing is good,have 12volts at coil when in start mode but no 12volts when in acc.Could it be altinator? i'm at loss at this one,if it help's I am using a malory optical insted of points and does anybody have a wiring diagram for a 455 miller boat.thanks.wetandwild