For 1990-2009 cars

# ENGINE MISFIRE/SURGE HOT BINDING THERMAC

WHEN DIAGNOSING FOR ENGINE MISS FIRE AND/OR SURGING AFTER WARM UP BE SURE TO VERIFY OPERATION OF THE THERMOSTATIC AIR CLEANER. FULL HEAT TO CARBURETOR AFTER WARM UP CAN CAUSE THE ABOVE CONDITION.

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.