Possible Cause
WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1992 Pontiac Trans Sport, 1992 Oldsmobile Silhouette, 1992 Oldsmobile Bravada, 1992 GMC Yukon, and 1992 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.
Incorrect slow idle adjustment.
Faulty fast idle solenoid.
Plugged fuel return system.
Glow plugs turn off too soon.
Incorrect pump timing.
Limited fuel to injection pump.
Air in injection lines to nozzles.
Incorrect or contaminated fuel.
Faulty injection pump.
Fuel solenoid closes in RUN position.