[StarGate]

It sounds a lot like mine did after a breakdown followed by extended storage many years ago. It mostly ran on 2 cylinders, would constantly hang at 4k rpm or just jump up to 4k from idle all by it's self. I put new coils on when I noticed the spark was weak but that didn't fix anything. Turned out to be 3 things I did that fixed all that. I did the coil power rewire mod, put new manifolds on, cleaned the carbs after letting the bodies soak in berrymans carb dip. That took care of mine.