It is infrequent, mostly after the car is running 1 or 2 minutes. the idle will just drop instantly when the car is brought to a stop, usually the idle recovers and stays fine, rarely it will stall, but will restart afterwards.. I was thinking of doing plugs / wires, it has a new gas filter about a year ago. Just looking for some ideas to approach this. Thank you

Perhaps try cleaning any sludge built up in the throttle bore and on the throttle plate?

I did that a a couple of months ago along with cleaning the pcv, but I will give it another check, thank you. I usually spray carb cleaner in and use a small rag to wipe the area so I can see how dirty it is, is that ok?

Try cleaning the idle control valve. Seafoam works pretty good for that.