I'll start cheapest to most expensive...lol
fuel pressure up, clean all the grounds, check wires, check cap-rotor, Install the MSD go for a blast. If it still falls apart, I'll check the springs.
The gas SHOULD be good. I added stablizer last year, and have driven it a lot over the winter. It had 10 gallons of new 93 in it...Unless that gas was older (sitting in the ground for a while).