The direct ignition cassette can fail causing the engine to die while driving, and/or it will crank but start. The engine may also have a rough idle and run roughly. Diagnosis may discover trouble codes for random misfires.
Car Problem Reports
Saab 9-3 Engine Dies while Driving Or Will Crank but not Start
Saab 9-3 Problem
Engines Affected: 2.0L 4 Cylinder Turbo, 2.3L 4 Cylinder Turbo