CONDITIONS MAY BE ENCOUNTERED WHICH INCLUDE POOR COLD STARTABILITY, PLUG FOULING, AND GENERAL TUNE-UP MAINTENANCE. REPLACE R42TS SPARK PLUGS (P/N 5613324) WITH R42CTS COPPER CORE CENTER ELECTRODE SPARK PLUGS (P/N 5613808). USE APPLICABLE LABOR OPERATION.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.