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One general thing to always consider with a push-pull or bridge is to make sure there isn't a quiescent state where it sits with one side locked up.
Like with the ignition on and the engine not running.
Not sure how this works with the stock DME, but you need to have PWM any time Vcc is applied.
I heard the coils are good for about 30 seconds continuous.
What I heard, anyways.
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Warning: May contain traces of nuts.
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