I have got a s1 rs turbo and converted it to efi ofab but on tickover it's revving at about 1500 - 2000 rpm I have changed the tps,idle speed control valve,coolant sensor it's got the black act sensor. If I unplug the idle apped control valve the car runs fine anyone else had the same problems many thanks

 

Anybody got the same problem as stuck for ideas what to check