Engine Performance problem
2004 Other Fiat Models 4 cyl Front Wheel Drive Manual 60000 miles

Good Day!
I wonder if you could possibly assist me in this matter.
I stay in Durban, South Africa, but have had no joy with having my Punto’s problem fixed. I have a 2004 1.2 Dynamic Punto (old shape).
I just had ECU replaced due to the car cutting out and the diagnostic test stating that it was a faulty ECU. I STILL HAVE THE PROBLEM!
I have scoured the FIatForum.com website and have come up with the following possible causes:
• Faulty crank sensor
• Faulty lambda sensor
• Fuel injectors may need cleaning
• Idle control valve may need cleaning or the air flow meter.
• Fuel pump may be faulty.
The car will only ever cut out if I am in low gear and rolling to a stop. NEVER whilst driving on freeways or otherwise but only when I come to a stop. Doesn’t matter if I been driving for 2 minutes or two hours.
Have you ever heard of this?

Please, if anyone could offer assistance, I would be SERIOUSLY grateful.
Many thanks