Very recently i started having a idle problem, my idle was set at 1k but now in neutral sometimes it goes from 1k to 1500 rpms.

I have screwed down the valve in the fitv, now the surge has decreased but is still there. The surge is not constant, sometimes it holds 1500 rpm for quite a while.

With the engine fully warmed up I still have suction on my bottom port in the throttle body. If I cover both holes in the tb my rpm decreases but the engine still runs fine.

Should I order a new fitv or is this a vacuum leak issue?

Edited
I ordered a new fitv the old one the needle wouldnt move even after putting near boiling wAter in the coolant ports of the fitv