Problems when idle and now power at low revs

[323typeR]

I just started having this problem & im very confused. I noticed that when i was driving and taking off from 1st gear between 800rpm -> 2000 rpm there is no power, however after 2000rpm the car goes fine.
Along with this problem i noticed that when the car is idle at a set of lights the revs start fluctuating between 500rpm -> 1100rpm. Noticably this happened on a hot weekend.

BTW. in both occasions the engine temp gauge stays below the 1/2 way mark.

I only recently had it service and replaced the air filter. I was wondering if anyone has any ideas on what is wrong with my car.

Thanks in Advance

[vladlos]

reset ur ecu and then start the car up and let it idle for like 5-10 minutes before driving to set everything back to standard. after driving for a little the ecu will adapt itself to changes and ur car will run better.