idle problem

running out of things to check or change 

hi dooby well its down to 1000rpm its ok when cold it sits at 850rpm ive changed so far the injector seals tops and bottoms,seal on the top of the throttle housing,most of the vacuum pipes 1 more to do bit of a nightmare to reach though,ive taken out the ecu for a couple of hours to reset it cleared all my fault codes so im running out of ideas now!!!!