For 1990-2009 cars

# HIGH, ROUGH, UNSTABLE IDLE VACUUM LEAK

High, rough, or unstable idle condition may be caused by vacuum leaks by the TBI cover plate to inlet gasket area on Firebird crossfire injection engines.

When this occurs, check the entire area of the TBI cover plate gasket for vacuum leaks.

If leaks are detected, remove the cover plate and gasket, replace the gasket (Part Number 14044605), reinstall the cover plate, finger start the attaching bolts and studs and tighten to 20-34 N.m (15-25 ft. lbs.).

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.