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[jasonp]

So, Ive swapped the engine in a Bugeye WRX.
 
On the OBDII scanner the P0519 code came up.
 
I replaced the IACV with another unit (second hand) which I cleaned, a new gasket and new allen key bolts.
 
The car then idled fine. I thought the problem was fixed.
 
Now, when the car is started cold it will run at 2000 revs until the car warms up and then as soon as the revs drop down the check engine light comes on and the engine starts labouring.
 
What am I missing here?
 
Thanks for your help.