at idle, when i first turn on the car and let it run for like a min or two.. it starts to lose power and about to stalls but doesnt.. and keeps doing that every like 15 sec or so.. and after i drove it for like 3-5 mins... it doesnt do that anymore...

any idea guys?

 

Sounds kinda like what mine had; although, mine was a bit more severed.

In my case I had to replace the EGR valve and the cyl. head temp sensor. I'm sure there's some other explanation for your case.

 

check all your cold start equipment: Thermotime switch, cold start valve and air regulator. Any one of those can easily cause a crappy idling condition and then have no effect after the car is warm.