What causes cylinder 1 to misfire on 4 Cyl 98 honda accord?

Yesterday I started my car and the check engine light came on and started flashing. My engine was running rough at a stop and slow speeds almost like it was about to kill. Checked the code and got p0301 which is cyl 1 missfire. Replaced the plug and sounds better but still sputtering checked distributor cap which seem fine but there were shavings inside which could be from the rotor. Should I replace it? What else could it be? Thanks for the help