Bravas/Bravos can be known to develop a juddering clutch and diagnosing the root problem is not always simple. I’ve heard cases where different mechanics diagnose different things for the same car; clutch, fluid, engine mount, tracking issues are all worth a mention. It could be any of these, but some are inter-related.
If I was to guess I would go with Clutch – over time the springs in the clutch get fatigued, loosen and cause a judder. it’s always worth checking the engine mounts also, as these can deteriorate (because of the judder in the clutch).
A good place to go for more info on fiat issues is: