Yesterday replaced the spark plugs which looked like the originals and TCV (OEM). The car is running at least 20% better...no hesitation, stuttering and pulls like an ox....<p>This morning after 40-50 miles of driving I have a CHECK ENGINE light...????? Still runs perfect. Did I need to pull a fuse, reset anything, unhook battery? <p>Going away for the long weekend don't want issues...Thanks.