Apparently. The TSB says (again for some 98 GLTs):
Background:
An engine control module (ECM) software upgrade is available to enhance overall engine speed performance. This will smoothen the occasional variation in engine speed which may be experienced on some vehicles.
The Service Campaign 81 equipment will be used to perform this one time software upgrade. You will be provided with two diskettes to update Service Campaign 81 equipment, an initial supply of labels and a new user's manual 2-28-0006 which explains how the equipment is to be utilized.
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