How do I wire three coil packs??

How do I wire three coil packs for flaming exhaust??

I have the obvious one running the distributer and two more under the rear bumper to power two sparks plugs in my exhaust (the propane tank is in, and plumbed). I cannot figure out how to wire these into the car. I ran a hot wire from a momentary switch to the coils in the rear and then grounded the other connection, and i got a spark each time i hit the button, but what I want is multiple sparks when i hit the button. So i spliced the two wires from the coils in the rear to the coil under the hood, hit the button and the car dies. If anyone knows how to correct this, please let me know. A diagram would be really nice

Does no one know??

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dude, you're awesome, i will look deeply into that. I am on a mission to get this working exactly how i want, and almost no cost is going to limit me....I would love to build this myself instead of just buying something. I am very hands on and this is great info for me, thanks