on certain day when im driving and i get stock in traffic my rpm starts to go nuts.
i was driving in a mild traffic then on a stop light my car is in neutral the rpm stays at 1500 rpm then i press the gas a little bit then it goes back to normal around 900-1000. this happens every at every stop light.

i have search it here but i couldnt find any answer

 

It can be a learning process.
I would reset the ECU(3* fuse from top)and,give it time to learn;don't press the gas,(idle at a stoplight)even if it dies on you.

 

I would just unplug the battery and reset the ECU that way. If that doesn't work, you might try an MAP Whack... just unplug and replug it back in (the plug that says "Denso" by the throttle body)

 

it's happened to me before... nothing to really worry about...

but I agree with Emil St-Hilaire if you want to fix it. Just follow his steps...

 

i have done the map whacked i guess i have to do the ecu reset