2004 Misfire help!
I had a wee bit of a misfire on my car when I got it so recently I upgraded my Coil pack to the screamin demon, got MSD wires and changed all my spark plugs with the NGK platinums, I was told it was a quick fix and nice little upgrade. Problem is yesterday on a drive home cylinders 3 and 4 misfired to the point of sputtering and hesitating. I had to put on my old coil pack to resolve it but it still has a slight misfire just not as bad. Can anyone give me some possibilities?