1. Clear the code by pulling the positive lead off the battery for 60s. Start and drive the car to see if it comes back.
2. Make sure you're running premium fuel, always.
3. Pull your plugs and inspect them for signs of lean/rich condition and oil burn. Are you running colder plugs for the boost? Pull your dipstick and smell your oil for hints of fuel as well. Also, if you have access to 6 new coil packs and/or plugs, bolt and plug those in, clear the code again, and take a drive.
4. Do a compression test.