Engine - Rough Idle and/or Stalling At Idle

87chevy19
GMC NUMBER: 84-T-102

GROUP: 6C - Engine Fuel

DATE: October, 1987

CORPORATE
NUMBER: 436502
SUBJECT: ROUGH IDLE (OR STALLING AT IDLE)

MODELS: 1983-84 S/T TRUCKS EQUIPPED WITH 2.0L ENGINES (VIN CODE Y)
Some 1983-84 S/T trucks with 2.0L engines may experience a rough idle condition (at idle or off-idle) that is generated by a lean mixture. Normal service manual diagnostic procedures should be followed to isolate the cause of the lean mixture. The EFE isolator/gasket below the carburetor should also be checked for vacuum leakage, contributing to the lean condition. If the EFE
isolator/gasket is identified as the vacuum leak source, then the isolator/gasket should be replaced using procedures in Section 6C-Engine Fuel of the S/T Service Manual. The EFE isolator/gasket (P/N 14018761) is available from GMSPO on their "Target Program" and is covered by GM's 5 yr./50,000 mile emission warranty. Use applicable labor operation and time.