Possible Causes & Corrections:

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.

Check thermostatic air cleaner damper door for proper operation.
Ensure park/neutral switch is properly adjusted.
Check for intermittent open or short to ground in Torque Converter Clutch (TCC) or HEI by-pass circuits.
Check canister purge system for proper operation.
Check ESC system for proper operation.
Check EGR system for proper operation.
Ensure initial ignition timing is properly set.
Using Spark Tester (ST-125), check for adequate spark output.
Check O2 sensor for lead or RTV sealant contamination. Such contamination causes a false high voltage signal to ECM, which responds by leaning air/fuel ratio.
Check in-line fuel filter. Replace if dirty or clogged.
Check fuel for water contamination. Ensure fuel system pressure is correct at all engine speeds.
Remove spark plugs, and check for wet plugs, cracks, improper gap, burned electrodes or heavy carbon deposits. Also check condition of distributor cap, rotor and spark plug wires.
Check A/C for excessive charge.
Check for restricted exhaust system.