So I got check engine codes for misfire in all four cylinders. I thought it was due to bad e85 from over the winter fowling plugs. I changed the plugs and it came back on. I just added fuel system cleaner and am going to drive it for like 20 miles and then see if it stays off or still misfires. with a misfire in all four cylinders what would it be? ignition coil pack or some thing?