1987 E150 won't start

Replaced plugs,wires,cap and rotor and all I get Is a muffled (poof) sound while cranking engine.

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check your firing order. you put a plug wire or two on wrong

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Engine will start to crank and then stop. Getting gas,also replaced cap, rotor,wires,and plugs.Stops as If It's not getting any juice from battery when starting.Battery is charged.NEED HELP!
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