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.
Leaking injection line.
Plugged fuel return line.
Air in lines to nozzles.
Air in injection pump.
Faulty nozzle.
Improper or contaminated fuel.
Uneven fuel distribution.