Yeah I get that, or if the tune was way off. I've owned the thing 10 years, never an issue like that.
It's not too rich, no misses or anomalies, cruising smoothly as could be under basically no load, then BANG.
Felt like it was running out of gas right when popping out the exhaust, resumed its normal smooth running after a minute or so of trying to blow the mufflers off.
Tried to induce it accel/decel at the time, and afterwards, neither had any effect that would indicate a problem.
I'm gonna poke around at wiring, plug wires, and the HEI and see what's up.