Fiat uno 1.0. IE shuts off during driving

As every old car…My dear Fiat Uno 1.0. Has a problem while driveing..it randomly loses all power and I need to stop until it shuts off completely and if I press the clutch during that state while in motion it also shuts off..

Then If I try to restart it: 1) starts without a problem or 2)crancks a bit longer until it starts..

I’ve also noticed that sometimes it loses power completely but “snapps out of it” and everything seems fine…

As I have another uno for parts that didn’t have any problems of that sort..I’ve put in a new fuel pump that was brand new in the other uno, changed the air filter, fuel filter, old fuel line, changed the spark plugs, spark plug wires, distributer and distributer cap, ignition coil…

Haha I’m dazzled what could still be the problem…

Any suggestions what to check and what components can I try to replace from the other uno? ://

I thank you all in advance and sorry for my bad english 🙂

Cheers!