ENG.STALL - INITIAL COLD START INTERMITTENT STALL ON DECEL.

MODELS AFFECTED: SOME 1986 AND 1987 SOMERSETS AND SKYLARKS AND SOME 1986 LESABRES EQUIPPED WITH 3.OL MFI ENGINES (VIN CODE L)

NOTICE: This bulletin Supersedes Bulletin 87-6E-20 dated July, 1987, due to a change in the 1986 LeSabre PROM calibration. Please discard 87-6E-20 and replace it with this revision which provides an updated service PROM part number.

Some 1986 and 1987 Somersets and Skylarks and some 1986 LeSabres equipped with a 3.0L MFI engine (VIN Code L) may experience one or more of the following conditions:

- Poor cold driveability (tip-in sags, hesitations, rough idle).

- Will not stay running on the initial start when the engine is cold (with proper fuel pressure and no leak down).

- Engine intermittently will not stay running on decel or during parking lot maneuvers, under closed throttle conditions.

If any of these conditions are experienced on a vehicle when the basic engine, controls and systems are performing properly, and cannot be repaired by using currently published service and diagnostic procedures, it may be necessary to install a new Service PROM.

These PROM's are currently available through General Motors Service Parts Operation (GMSPO) under the following part numbers:

Axle Sales Code Scanner PROM Model I.D. Located On I.D. If This PROM Service Application Axle Deck Lid Decal Is Installed Part No. ----------- ---- --------------- ------------ ------- 1987 Somerset/Skylark 2.53 F16 1294 16081263 1987 Somerset/Skylark 2.84 F17 1304 16081268 1986 Somerset/Skylark All N/A 8590 1228590 1986 LeSabre All N/A 8724 16088725

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.