vauxhall corsa ( please help )

[snowball2]

i have a corsa 1litre 3 cylinder
the engine emissions are high
i've had the idle control valve renewed
the mass air flow sensor renewed
the gas recirculation valve renewed
the lambda sensor renewed
but still high emissions
it runs well and starts well but it stalls when i drop the revs. but will tick over no problem if i slowly lower the revs and the idle control valve takes over
any ideas how to cure my car problems ?
any suggestions what so ever ?

[Full Tilt]

Hi Snowball,
Considering what you have renewed I think the only thing left is the catolytic converter in the exhaust system has a fault, could be pricey unless you can get a spurious part. Hope that helps. FT

[snowball2]

the plug in diagnosis reader says the cat ok

[Cockney_si]

I would agree with Full tilt, although the cat could well be working it could still not be working enough reduce the emissions.

[dougielogan]

It is possible you could have an air leak in the inlet manifold side of things.