ENGINE STALL WHEN VEHICLE IS PLACED IN GEAR (REPLACE PROM)

VEHICLES AFFECTED: 1990 C/E/K WITH 4.5L, VIN 3

Early Production 1990 Devilles, Fleetwoods, 60 Specials (built before VIN breakpoint 217229 for Federal emissions), Eldorados (built before VIN breakpoint 600811 for Federal emissions), and Sevilles (built before VIN breakpoint 801006 for Federal emissions may experience an engine stall when placed in gear immediately after a cold start. This condition is caused by an improper PROM calibration in the MEM-CAL unit.

To identify the improperly calibrated PROM enter diagnostics, select ECM data, parameter ED99 PROM I.D. for Eldorados and Sevilles and parameter E.2.5 for DeVilles, Fleetwoods, and 60 Specials. Check the parameter display against the PROM I.D. in the chart listed below. If application and PROM I.D. match, install the new service MEM-CAL listed in the chart to correct the stalling condition.

NEW NEW NEW PROM Broadcast Service PROM Broadcast Carline I.D. Code MEM-CAL I.D. Code ------- ---- ---- -------- ---- ---- DeVille, Fleetwood-Fed 357 ATNR 16147006 360 ATTT 60 Special/Comm.-Fed* 355 ATNN 16146998 362 ATTR

Eldorado, Seville-Fed 1012 ATNP 16147002 1020 ATTS Seville STS-Fed 1014 ATNH 16146975 1017 ATTK

Removal and installation procedures are located in Section 6E-C1 of the Service Information Manual.

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.