Idle Giving Me The Shits, Any Recommendations

[manuel]

Here's the dilema. r33 gtst

Car runs a power fc and was tuned by unigroup engineering and used to idle perfect, run perfect.

The car idles at 1400rpm when its cold and then it settles at 900rpm when its warm. The problem is that after you drive the car and then slow down to complete stand still the revs climb back up to 1500rpm and then settle down to 900rpm after 7 seconds or so. This happens evertime i drive the car. Previously the car never had a problem and remained stable with the revs at 900rpm. this problem has arisen over the last few weeks.

Things i have checked

Airflow meter cleaned

AAC valve cleaned

hoses checked

What could it be, any recommendations guys....

[Thelen]

Any extra electronics that might be drawing from the engine?

[manuel]

Problem seems to be rectified.

I adjusted AAC valve and brought down the revs with idle screw. Car seems to idle at 900rpm and remains there constantly.

Hope it stays this way.