Corsa 1.4 Idle when Warm

[VXAL]

I am having an issue with idle when warm on a Corsa 1.4 single point injection.
I initially thought it was the ICV and replaced this (twice with second hand parts off same model/engine size of vehicle).
It did not make any difference.
The issue is, while the engine is cold it runs fine.
When the engine warms up the idle is no longer controlled below 1000 rpm and runs away. Then the engine light comes on a little later.
The car is still usable, but just does not idle at the correct speed - it revvs its head off when clutch not engaged and engine not under load.

Would it be good to get a coder reader and see what the error is?
Is an EGR clean a good way forward?
Is this an engine temperature sensor issue as the car is fine when cold?
Where to start?

Thanks!

[matty101]

if the eml has come on the ecu shud have stored a fault code, try the paper clip test or get it to a garage.

[Sam58]

Give the egr a good clean, there is a how to on here, or on corsasport.co.uk.