check eng. code(po304 info please????

i have a 3.8 windstar and am receiving a po304 (misfire in bank 4) am i right in assuming this is probally a spark plug wire or spark plug itself???
isn't bank 4 in the front of the engine facing firewall???,thanks
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The code means cylinder #4 the problem. It does not mean that it is ignition, fuel or mechanical, it just means cylinder #4 is not contributing. Ignition is the most likely system that has failed. The cylinder numbers are 123 on the side of the engine that faces the firewall, 456 are on the radiator side of the engine.

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