looks like a good deal, depending on how much money you were owed.
would you really consider breaking it just because it wont idle. personally i think that is nuts and to be honest i get a bit fed up of people breaking perfectly good cars with tax and MOT that dont require much work as there arent a massive number of these around.
its a white corrado so it wont be worth as much as a black or blue one but on a K reg it should be a 2.0 16v an worth >£1000
16v can have a few reasons for not idling a ISV can be removed and soaked in petrol over night and this can work wonders. As others have suggested vacuum leaks from the pipework around the head can cause issues.
