1.8 auto pulling away too quick

Hi, not sure where to put this or if anyone can help but my wifes 1.8 auto was cutting out when starting up and occasionally when first driving, the revs were also really low. I have changed the idle air control valve and that has stopped the cutting out but now the revs seem a bit high even tho i have adjusted it as far down as it can go. It is also now pulling away a bit on the fast side without me even pressing the accelerator. Not sure if anyone knows how i can sort this? Thanks robert.
 
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