For 1990-2009 cars

# SURGE OR CHUGGLE 40-50 MPH REPLACE SERVICE PROM

#### SUBJECT: SURGE OR CHUGGLE UNDER MODERATE ACCELERATION

#### MODELS AFFECTED: 1988-1990 BROUGHAMS WITH 5.0L ENGINE

Some 1988-1990 Broughams with the 5.0L engine may experience a 40-50 mph surge or chuggle under moderate acceleration with the torque converter clutch engaged.

A service PROM is available through GMSPO that will address this condition. These service PROM's should only be utilized in cases where it has been determined that the condition is not caused by engine mechanical or ignition systems.

Refer to the chart below for the appropriate PROM application:

Service Service Service Emission PROM PROM Broadcast Model Year System P/N I.D.* Code + ---------- -------- -------- ------ ------ 1988 Cal. 16156504 6483 AWPK 1989-1990 Cal. 16156639 6493 AWPL 1988-1990 Fed. 16156673 6653 AWRD

* PROM I.D. can be read with a scan tool connected to the ALDL connector.

+ Broadcast code can be seen through the access hole on the top side of the PROM.

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.