My car for some reason when istart it , it goes up and down on te rpms . Like 2000 rpm down to 1500rpms , and does that back and forth.

 

Have you done anywork on the cooling system? I just replaced my timing belt and water pump.and it did that until I bled the cooling system.

 

The idle air control module could be dirty or it could be low on coolant

 

Warm the car completely up and then take off the fitv and tighten the plastic down until it bottoms out. It's important to do this when the car is warmed up and not when it's cold. There's a sticky in the faq's for the "fitv" just look.

 

Yeah sounds like you need a good cleaning on you're FITV (Fast idle thermal valve) and IACV (Idle air control valve) Both will be located on the throttle body and are fairly easy to clean with minimal tools required.

My car had the same problem yesterday literally, I popped my intake off & gave both a good cleaning. Aswell as gave my throttle body a good scrubbin and my idle is now smooth as butter.

 

So how do i do this ? Im nt good with cars at all .

 

Its located right beneath your're throttle body. You must remove you're air intake and theres like 3 bolts remove it, take the FITV apart and spray it with throttle body cleaner/carb && choke cleaner, put it back on and you should be good.

 

Iacv valve same thing is wrong with my ep3 seemingly it happens to alot of them

 

I guess i had a clog in my cooling system , so i had someone flush it , and it still does te same problem. Only when its cold though