I think I really scewed up during initial start up...

C130 Chief said

Shutting the engine of at 2500 RPM shouldn't have hurt anything internally. Snort, pop or run-on would have been normal given the fact that the throttle blades were open a fair amount. But a good backfire might have popped a vacuum line, so look around.

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Yeah, definitely true there......hey, one other thing I've seen (but not often..) is a coil that is internally shorted, which will cause a weak spark and the ballast resistor to run hotter than normal. I've seen it a few times, but not much.....but you'll definitely need a nice hot spark.

Oh, and if you're running a "box"....make sure it's getting 12 volts going to it.....not the "low 9-volt side" of the ballast resistor.....lol.