1998 Toyota Corolla came into the shop today (1/26/16) because the vehicle is running rough and the check engine light is on. DTC’s were p0300, p0301, p0302, p0303 These trouble codes were pulled using Autel Maxisys mini ms905k. We later discovered that this vehicle is burning oil so severely that the plugs are getting build up on them after just 6 weeks. Customer did not want any further diagnoses. How to change valve cover gasket and tune up on 1998 Toyota corolla.