Just after a bit of help regarding a.

Hi,
Just after a bit of help regarding a high idle problem
I'm having with my EL Falcon, This is whats happening when started the idle sits at 2000rpm give it a rev and it will hold at 2500 once warm it will stay at 2700 when I unplug ics it drops by 500 unplug vac from map sensor and it will down by 800rpm but runs very rich.
The work I have done so far is inspected vac lines including brake booster hose swaped icp map and ecu from my other el tightened intake manifold swaped o2 sensor cleaned the throttle body and checked pvc all were good but the problem still exist's any help would be great. Thanks