Little issue (btw. any super 6 stuff not ur not using?)

I would check my plugs. Take a couple out and compare to this chart.

http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html

That'll get you going in the right direction.

Turn the motor over with the spark plug grounded and see if you got a nice blue flame when the plug fires.

The amp gauge might be going crazy because lack of RPM when the engine is dieing. Once you rev the motor and hold at a higher RPM does the amp gauge needle steady out?