A defective thick film ignition (TFI) module can cause the engine to stall while driving, or the engine may not start. A failed TFI module will require replacement.
Car Problem Reports
Ford E-350 Vehicle Stalls While Driving, or Will Not Start – Engine is Warm
Ford E-350 Problem
Engines Affected: 5.8L V8, 7.5L V8
Average Mileage: 159,500 mi (159,000 mi - 160,000 mi)
Visitor, 1991 Ford E-350, 5.8L V8, 159,000 mi
replaced tfi, and all ignition wiring and parts
not fixed yet. stalled out while running, has not started again.