Hey OP.. I’m chasing the same demon on my ‘07.
Any luck ironing this out?
I have a donor car (death kart) that still has cats on it because I’m lazy.. going to swap the drivers side cats tomorrow......
My ‘07 motor is stock other than CAI and Stillen Catback so the motor/ECU should think it’s stock.
Intermittent rough idle and after driving for a while a P0430 code, but the freeze frame picks it up at highway cruise speed so I’m thinking misfire.. coil or injector.
When idling ... Odd thing is when I watch the bank 2 AFR (sensor 1) it hovers around 0.8V until it starts misfiring/rough idle and the reading goes up above 1.1V then it corrects and goes back to normal string 0.8V. That would suggest that the engine is running rich when the idle gets choppy, so bad coil is the likely culprit since the plugs are new .
Frustration .....
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