I have a 80 xs , 277 rephased with pma alternator. For the past month my engine would occasionally cough once and pretty minor. I convinced myself that it might be a fuel problem? On the last ride, just before taking off, I flipped my headlight switch on and the motor died. I re started it, turned on the light and died again. Restarted it again, turned on the headlight and it ran, so I took of. Quarter mile down the road it started missing and back firing. I turned off the headlight while it was still running and it appeared to run much better. Made it back to my house. I'm running a Shorai battery, maybe 5 months old and appears to be fully charged. Put the charger on it and within a minute or two got the message that it was fully charged. Checked the voltage at the battery with the engine running and I, was getting 14 volts. That's where my knowledge of what to check is limited. Any ideas or anyone else had simular problems. Lastly all my connections are soldered?