Oh dear don't want to be the bearer of bad tidings but Punto's have ally heads on them and if you have all of the above sysmptoms then you will have a cracked head this is not a maybe you will.
You can get these welded and skimmed but it is fu*king expensive and doesn't always work so then you need a new head and head bolts and gasket kit and this all adds up.
p.s i know this to be FACT as my wife did to our Punto and boy was it a pain in the arse and iam a mech engineer good luck
edit :- no longer have this car as it was a right peice of sh*t(friday afternoon job)