Hi Everyone,

I had tried several things to fix my cold engine misfire. Was not a problem when the engine was warm, and only occasionally when cold. I tried the gasket/seal on the intake, new MAF, new plugs, new PCV/CCV (or equivalent), and oxygen sensors. None of this took care of the issue. Codes were cylinder misfire and oxygen sensor.

Last week I changed all coil packs.... everything is perfect now! Not sure which ones were bad, but nice to know it is solved. The oxygen sensor codes were actually a derivative of the bad coils.

Hope this might helps someone else chasing the same issues.

Mitch