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I just tested to see if this was true last week. It wasn't true. The truck will run with iether of the two coil packs disconnected. This is provided that the coil packs and wires are installed correctly in the first place.
The truck runs but doesn't run as well with only the front coil (intake side plugs) operating. Runs great with the exhaust plugs only, and runs best with both.
At least on my truck, both intake and exhaust side plugs fire when they are supposed to - for the power stroke.
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Good design is simple. Getting there isn't.
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