im having an inconsistent idle while at stop lights or in park. it sits at around 500 rpm, but when i first get it started from it being cold, the needle jumps around and it stalls sometimes. where should i be looking first? possible vacum leak? IAC valve?

 

IAC, FITV and a good tb cleaning...see what you have from there.

 

Yea, I had a REALLY bad idle surge, claned the IAC, and then tightened up the FITV and its better but I still have a very small surge randomly here and there, im thinking its when the heat is turned on and the coolant is not bleed or filled properly.

https://honda-tech.com/forums/honda-accord-1990-2002-2/cleaning-iacv-fitv-tb-1844067/