Last week I replaced my spark plugs which looked to be copper plugs with some new champion double platinum spark plugs. It ran epic until yesterday when it wouldn't start up after turning it off, I was finally able to start it while pumping the gas pedal but it would not stay running. After pushing it home I ran it long enough to get a code, p2308-ignition coil "c" secondary circuit. I cleared the code, moved the coils around and started it back up and it ran better and had a different code P0300-random multiple misfire. I went and bought two new coils and and installed them, I tried them in multiple different combinations and still get the multiple random misfire P0300 ! But after adding two new coils it ran even better than before. It seems to idle without me using the gas pedal for a while but then eventually dies. Does anyone have any idea what this could be ? I would try to re-install the old plugs but the wife threw them out already !