ROUGH IDLE OR HESISTION COLD (NEW PROM MAY REPAIR -P/N)

Model and Year: 1987 CORVETTE EQUIPPED WITH MANUAL TRANSMISSION

New service PROMS, referred to as MEMCALS in the shop manual, have been released for 1987 Corvettes equipped with manual transmissions.

These PROMs will address comments of poor idle stability with a cold engine and tip-in hesitation during warmup.

If normal engine diagnostics are unsuccessful in repairing one or both of the above conditions, the PROM should be replaced with the appropriate PROM from the table below:

Vehicle Model Transmission Service PROM P/N ------------- ------------ ----------------

Corvette Coupe MK2 16074756

Corvette Coupe MH5 16074762

Corvette Convertible MK2 16074805

Corvette Convertible MH5 16074800

Calloway/Export MK2 16074820

Use applicable Labor Time and Operation Number.

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.