After my successful rear shock replacement, I threw some ominous codes. Dr. Came back with a P0301. Wth. Cleared and ran some errands. While out, at idle, she was doing the Texas Rattlesnake under the hood. Drove home with my seat and face as close to the dash like the gf; heard a few more rattles mostly at lower speeds with ICE on. Threw another code, this time P0303. Pulled the plugs. Left: ~20k Right: ~98k Reinstalled the old plugs. So far, no codes or rattlesnakes under the hood.