So about 2 weeks ago, my check engine light came on and I got back that it was a "misfire in cylinder 3". So I replaced the spark plugs and everything has been fine since then until yesterday. I just got done filling it up and the light came back on once I started it up and it idled very strange (whole Jeep was shaking and would accelerate right). I got back that it was a "misfire in cylinder 3 again." The light hasnt come back on since but it does idle strange right when I start it up after turning it off for only about 5-10 minutes. Does anybody know what the cause of this could be?

I recently Seafoamed the Jeep....could that be it?

Thanks