please help Starting pb ignition?

Hi everybody

91 1.6 SOHC carb 323:
car stalled while driving, wouldn't start again.
checked fuel pressure (mechanical pump) -> seems fine.
no spark at the plug
no spark at distributor

played a little bit with connectors and wires, checked the condenser and the car started and ran for about 30s and then stalled and wouldn't even crank....
Few minutes afterwards, engine would crank but not start...

Seems to be an intermittent electrical or ignition pb.
Any ideas?
Thanks

check ur gas pump!...