hi all i have a 1997 punto 1.2 8v 60sx when the engine is cold it runs very quite through all the gears it has plenty of power. the strange problem i have is when the car reaches operating temerature the engine starts rattling quite loud the rattle increases when i rev the car but does not do it on tick over it starts around 2000rpm it defenatly is from the engine but no idea where it's coming from. the car has fsh it has no misfires runs smooth even when rattling i hope someone can help it's driving me mad? thanks in advance i have done a search checked heatshield done cambelt+tensioner and full service done but it's still doing it.