Ignition Coil Resistance
WARNING: This page does not describe the selected car, but rather 34 other vehicles, including the 1991 Pontiac Sunbird, 1991 Pontiac Grand Prix, 1991 Pontiac Grand Am, 1991 Pontiac Firebird, and 1991 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect leads from ignition coil. Using an ohmmeter, check ignition coil secondary resistance. Secondary resistance should be less than 10,000 ohms on all models.