It is most likely you coil...please have the coil checked...one way is to swap and coil from another cylinder and sheck and see it the cylinder misfire changes to the other cylinder
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that pertains to random secondary ignition missfire.possibbly another code to help pinpoint which cyl. is missfireing po304 #4 cyl. spark plug,boot/wire coil/or individual coil pack,ignition module.check in that order.need more info year,vin,etc.
you may try your rotor button and distributor cap. and spark plug wires. try your map sensor also they tend to cause a lot of misfiring if they go bad.hope this helps.
p303 is a cylinder 3 missfire I woul first check the coil and then the ingnition module, Then if this dont work you could have a bad injector. If after testing and still no fix you should check the compression in that cyl.
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