The fuel filter is part of the fuel pump unit (all in one) in the tank, fuel pressure is 49 psi, check the fuel pressure, check plug wires (ohm them), also take the coil to Auto zone and they will test it for free, I have run into all of these potental problems.
Check your high tension leads or plug wires. If you find one out of the correct resistance range, about 7ohms per foot, dont discount that the missfiring has damaged the coil pack for that cylinder as the wasted spark had no where to got except hammering the coil pack. As for the fuel filter refresh them often as the standards of fuel from the pump can vary
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