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 air filter and fuel filter. Replace if necessary. Check for incorrect fuel pressure.
Check injector wires for short to ground at air cleaner.
Check thermostatic air cleaner damper door for proper operation.
Ensure initial ignition timing is properly set.
Check TCC system for proper operation.
Check ECM grounds.
Check ESC system for excessive retard.
Check EST system for proper operation.
Ensure EGR valve is not always open.
Check exhaust system for restrictions, such as a damaged or collapsed pipe, muffler or catalytic converter. See EXHAUST SYSTEM BACKPRESSURE under MECHANICAL INSPECTION in BASIC TESTING article.
Check charging system output. Repair charging system if voltage is less than 9 volts or more than 16 volts.
Check MAP sensor output.
Using Spark Tester (ST-125), check for available secondary voltage.
Check engine valve timing and compression.
Check engine for a worn camshaft.