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Check the coil, a good test is to change the coil with another cylinder and see if the misfire moves to that cylinder, if it moves then you will know its the coil make sure to mark it so you know which one to replace, this is very common for coils to go bad, heres a diagram to help you locate #4 cylinder.couldnt get diagram but if its a four cylinder then #4 is the last one back if its a 6 cylinder then it will be the first cylinder on the driverside .first cylinder from the front to rear,
P0304 means that cylinder 4 has a misfire and P0305 is a cylinder 5 misfire. What this means is you may have bad spark plugs, or bad plug wires, or you may need to replace your distributor cap and rotor. I would start with plugs and wires.
Basically, your number 4 cylinder is misfiring. Maybe a bad spark plug, or bad fuel injector. These causes are only guesses because many thing can cause a misfire in one cylinder.
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