ECU

[Al Bundy]

My daughters ford sportka started mis firing badly,took it to a mate whose code reader said no3 fuel injector and 2 spark plugs,changed them and all seemed ok,next day misfiring again,my mate tried everything off another car but couldnt stop it misfiring.Got another mechanic out whose reader said cam sensor,changed that and no different,plugs his reader in again and its saying ecu fault,seen one on the bay for £35,is this a case of just swapping it over?