[jlsat3]

Hello,
Got in my 2013 L99 today and the CEL started flashing with a little roughness to the engine. It goes off, flashes, goes solid. Stabil trac lights all came on too, they went off once, but mostly stay on.

Eventually throws a P0304 code. Car shakes, domelight dims a little with the shake.
-Switched spark plug wires between cyl 2 and 4, reset CEL, still throws a P0304. Sparkplugs are less than a year old.
-Then Swapped plugs, coil, and wires between cyl 2 and 4, still throws a P0304.
-Plug 4 did look to have more carbon than plug 2 before the switch
-Battery seems good with voltmeter

I have a tune that turns AFM off.

Those flaps in my exhast pipe towards the end...the driver side one seems to shake with all this.

I did get on the gas pretty good for a brief moment while getting on the freeway. Started happening after that. Only drove a couple of miles.

Its my daily driver with over 150k miles.

Any ideas?

Thanks.