Toyota Yaris gs mk1 x reg won't start

[Inteltech]

Hey all i was wondering if anyone could please help. I have the above car which won't start. When you turn the key it cranks and sounds like it wants to start but won't. Checked all the usual fuel, battery, connections and still won't start. Battery isn't that old in fact less than a year old coming upto a year. I am thinking of scrapping if I can't get it going again. Was working albeit a bit sluggish and throaty until one. Ugh the I was driving and it lost power and started to die until I stopped and engine stalled and won't start back over. I changed the cam shaft sensor to a different one I had spare in the boot and it sounded a bit better but still refused to start. Garage has said it's the ecu but I aren't sure had other people look and say different things. I will try and get a video or sound file of what it sounds like at the moment tomorrow and try and upload somehow. Thank you for taking the time to read and any help you can give is much appreciated