how many miles and last time plugs were changed would be good info as well. Not to mention constant cel or flashing.
Actually, no. The flywheel on my car was installed when I bought it, but I've seen it. Lightweight flywheels causes Cyl Misfire codes, usually all or most cylinders at once on the EJ20.
Mine used to throw misfire codes on the regular with the 2.0L. I bought a $50 dollar diagnostic tool and cleared them when they came on. Almost always threw multiples on multiple cylinders...pretty common on 2 Liters. Worry when they flash, lol.